Photographing lens assembly, image capturing unit and electronic device

ABSTRACT

A photographing lens assembly includes six lens elements which are, in order from an object side to an image side: a first lens element, a second lens element, a third lens element, a fourth lens element, a fifth lens element and a sixth lens element. The second lens element has positive refractive power. The third lens element has an image-side surface being concave in a paraxial region thereof. The sixth lens element has an image-side surface being concave in a paraxial region thereof, and the image-side surface of the sixth lens element has at least one inflection point.

RELATED APPLICATIONS

This application is a continuation patent application of U.S.application Ser. No. 16/046,483, filed on Jul. 26, 2018, which claimspriority to Taiwan Application 107102474, filed on Jan. 24, 2018, whichis incorporated by reference herein in its entirety.

BACKGROUND Technical Field

The present disclosure relates to a photographing lens assembly, animage capturing unit and an electronic device, more particularly to aphotographing lens assembly and an image capturing unit applicable to anelectronic device.

Description of Related Art

With the development of semiconductor manufacturing technology, theperformance of image sensors has been improved, and the pixel sizethereof has been scaled down. Therefore, featuring high image quality isone of the indispensable features of an optical system nowadays.Furthermore, due to the rapid changes in technology, electronic devicesequipped with optical systems are developed towards multi-functionalityfor various applications, and therefore the functionality requirementsfor the optical systems have been increasing. However, it is difficultfor a conventional optical system to obtain a balance among therequirements such as high image quality, low sensitivity, desirable sizeof the aperture, miniaturization or required field of view. Accordingly,the present disclosure provides an optical system satisfying theaforementioned requirements.

SUMMARY

According to one aspect of the present disclosure, a photographing lensassembly includes six lens elements. The six lens elements are, in orderfrom an object side to an image side, a first lens element, a secondlens element, a third lens element, a fourth lens element, a fifth lenselement and a sixth lens element. The second lens element has positiverefractive power. The third lens element has an image-side surface beingconcave in a paraxial region thereof. The sixth lens element has animage-side surface being concave in a paraxial region thereof, and theimage-side surface of the sixth lens element has at least one inflectionpoint. The photographing lens assembly further includes an aperturestop. When a focal length of the photographing lens assembly is f, afocal length of the first lens element is f1, a focal length of thesecond lens element is f2, a focal length of the third lens element isf3, a focal length of the fourth lens element is f4, a focal length ofthe fifth lens element is f5, a focal length of the sixth lens elementis f6, an axial distance between the aperture stop and the image-sidesurface of the sixth lens element is SD, an axial distance between anobject-side surface of the first lens element and the image-side surfaceof the sixth lens element is TD, a curvature radius of an image-sidesurface of the fifth lens element is R10, an axial distance between theobject-side surface of the first lens element and an image surface isTL, a central thickness of the first lens element is CT1, and an axialdistance between the first lens element and the second lens element isT12, the following conditions are satisfied:(|f/f1|+|f/f3|+|f/f5|)/(|f/f2|+|f/f4|+|f/f6|)<1.0;0.72<SD/TD<1.0;−0.90<f/R10<9.0;1.75<TL/f<3.0; and0.10<CT1/T12<3.3.

According to another aspect of the present disclosure, an imagecapturing unit includes the aforementioned photographing lens assemblyand an image sensor, wherein the image sensor is disposed on the imagesurface of the photographing lens assembly.

According to still another aspect of the present disclosure, anelectronic device includes the aforementioned image capturing unit.

According to yet another aspect of the present disclosure, aphotographing lens assembly includes six lens elements. The six lenselements are, in order from an object side to an image side, a firstlens element, a second lens element, a third lens element, a fourth lenselement, a fifth lens element and a sixth lens element. The second lenselement has positive refractive power. The third lens element has animage-side surface being concave in a paraxial region thereof. The sixthlens element has an image-side surface being concave in a paraxialregion thereof, and the image-side surface of the sixth lens element hasat least one inflection point. The photographing lens assembly furtherincludes an aperture stop. When a focal length of the photographing lensassembly is f, a focal length of the first lens element is f1, a focallength of the second lens element is f2, a focal length of the thirdlens element is f3, a focal length of the fourth lens element is f4, afocal length of the fifth lens element is f5, a focal length of thesixth lens element is f6, an axial distance between the aperture stopand the image-side surface of the sixth lens element is SD, an axialdistance between an object-side surface of the first lens element andthe image-side surface of the sixth lens element is TD, a curvatureradius of an image-side surface of the fifth lens element is R10, anAbbe number of the sixth lens element is V6, and a refractive index ofthe sixth lens element is N6, the following conditions are satisfied:(|f/f1|+|f/f3|+|f/f5|)/(|f/f2|+|f/f4|+|f/f6|)<1.0;0.72<SD/TD<0.95;−0.90<f/R10<9.0;7.0<V6/N6<33.0; and|f4/f5|<2.0.

According to yet still another aspect of the present disclosure, aphotographing lens assembly includes six lens elements. The six lenselements are, in order from an object side to an image side, a firstlens element, a second lens element, a third lens element, a fourth lenselement, a fifth lens element and a sixth lens element. The second lenselement with positive refractive power has an image-side surface beingconvex in a paraxial region thereof. The fourth lens element haspositive refractive power. The sixth lens element has an image-sidesurface being concave in a paraxial region thereof, and the image-sidesurface of the sixth lens element has at least one inflection point.When a focal length of the photographing lens assembly is f, a focallength of the first lens element is f1, a focal length of the secondlens element is f2, a focal length of the third lens element is f3, afocal length of the fourth lens element is f4, a focal length of thefifth lens element is f5, a focal length of the sixth lens element isf6, an axial distance between an object-side surface of the first lenselement and an image surface is TL, a curvature radius of an object-sidesurface of the second lens element is R3, a curvature radius of theimage-side surface of the second lens element is R4, a curvature radiusof an object-side surface of the sixth lens element is R11, and acurvature radius of the image-side surface of the sixth lens element isR12, the following conditions are satisfied:(|f/f1|+|f/f3|+|f/f5|)/(|f/f2|+|f/f4|+|f/f6|)<0.45;1.70<TL/f<5.0;−3.50<(R11+R12)/(R11−R12)<2.50; and0<(R3+R4)/(R3−R4)<3.50.

BRIEF DESCRIPTION OF THE DRAWINGS

The disclosure can be better understood by reading the followingdetailed description of the embodiments, with reference made to theaccompanying drawings as follows:

FIG. 1 is a schematic view of an image capturing unit according to the1st embodiment of the present disclosure;

FIG. 2 shows spherical aberration curves, astigmatic field curves and adistortion curve of the image capturing unit according to the 1stembodiment;

FIG. 3 is a schematic view of an image capturing unit according to the2nd embodiment of the present disclosure;

FIG. 4 shows spherical aberration curves, astigmatic field curves and adistortion curve of the image capturing unit according to the 2ndembodiment;

FIG. 5 is a schematic view of an image capturing unit according to the3rd embodiment of the present disclosure;

FIG. 6 shows spherical aberration curves, astigmatic field curves and adistortion curve of the image capturing unit according to the 3rdembodiment;

FIG. 7 is a schematic view of an image capturing unit according to the4th embodiment of the present disclosure;

FIG. 8 shows spherical aberration curves, astigmatic field curves and adistortion curve of the image capturing unit according to the 4thembodiment;

FIG. 9 is a schematic view of an image capturing unit according to the5th embodiment of the present disclosure;

FIG. 10 shows spherical aberration curves, astigmatic field curves and adistortion curve of the image capturing unit according to the 5thembodiment;

FIG. 11 is a schematic view of an image capturing unit according to the6th embodiment of the present disclosure;

FIG. 12 shows spherical aberration curves, astigmatic field curves and adistortion curve of the image capturing unit according to the 6thembodiment;

FIG. 13 is a schematic view of an image capturing unit according to the7th embodiment of the present disclosure;

FIG. 14 shows spherical aberration curves, astigmatic field curves and adistortion curve of the image capturing unit according to the 7thembodiment;

FIG. 15 is a schematic view of an image capturing unit according to the8th embodiment of the present disclosure;

FIG. 16 shows spherical aberration curves, astigmatic field curves and adistortion curve of the image capturing unit according to the 8thembodiment;

FIG. 17 is a schematic view of an image capturing unit according to the9th embodiment of the present disclosure;

FIG. 18 shows spherical aberration curves, astigmatic field curves and adistortion curve of the image capturing unit according to the 9thembodiment;

FIG. 19 is a schematic view of an image capturing unit according to the10th embodiment of the present disclosure;

FIG. 20 shows spherical aberration curves, astigmatic field curves and adistortion curve of the image capturing unit according to the 10thembodiment;

FIG. 21 is a perspective view of an image capturing unit according tothe 11th embodiment of the present disclosure;

FIG. 22 is one perspective view of an electronic device according to the12th embodiment of the present disclosure;

FIG. 23 is another perspective view of the electronic device in FIG. 22;

FIG. 24 is a block diagram of the electronic device in FIG. 22 ; and

FIG. 25 shows a schematic view of an inflection point on the image-sidesurface of the sixth lens element according to the 1st embodiment of thepresent disclosure.

DETAILED DESCRIPTION

A photographing lens assembly includes six lens elements. The six lenselements are, in order from an object side to an image side, a firstlens element, a second lens element, a third lens element, a fourth lenselement, a fifth lens element and a sixth lens element.

The first lens element can have negative refractive power. Therefore, itis favorable for providing a retro-focus lens configuration so as togather light with a large angle of view, thereby capturing more imagedata.

The second lens element has positive refractive power; therefore, it isfavorable for providing the main light converging power so as to reducethe total track length of the photographing lens assembly, therebyachieving compactness. The second lens element can have an image-sidesurface being convex in a paraxial region thereof; therefore, it isfavorable for strengthening the refractive power of the second lenselement and improving image quality with a larger angle of view.

The third lens element can have an image-side surface being concave in aparaxial region thereof; therefore, it is favorable for correctingchromatic aberration in the axial direction of the third lens element soas to provide images with true colors. The third lens element can havean object-side surface being convex in a paraxial region thereof;therefore, it is favorable for light converging in both tangentialdirection and sagittal direction so as to correct astigmatism. The thirdlens element can have negative refractive power; therefore, it isfavorable for correcting chromatic aberration so as to prevent imageoverlapping caused by light rays with different wavelengths focusing ondifferent positions.

The fourth lens element can have positive refractive power; therefore,it is favorable for providing light converging power on the image sideof the photographing lens assembly so as to correct aberrations. Thefourth lens element can have an image-side surface being convex in aparaxial region thereof; therefore, it is favorable for strengtheningthe light converging power of the fourth lens element so as to balancethe refractive power distribution on the image side and reduce the backfocal length of the photographing lens assembly.

The sixth lens element has an image-side surface being concave in aparaxial region thereof; therefore, it is favorable for reducing theback focal length so as to keep the photographing lens assembly incompact size. The image-side surface of the sixth lens element has atleast one inflection point; therefore, it is favorable for improving thePetzval field, reducing distortion, preventing vignetting and reducingthe size of the photographing lens assembly. The sixth lens element canhave negative refractive power; therefore, it is favorable for balancingthe refractive power distribution on the image side, correctingaberrations, and preventing the size of the electronic device from beingoverly large due to an overly long back focal length. Please refer toFIG. 25 , which shows a schematic view of an inflection point P on theimage-side surface of the sixth lens element according to the 1stembodiment of the present disclosure.

When a focal length of the photographing lens assembly is f, a focallength of the first lens element is f1, a focal length of the secondlens element is f2, a focal length of the third lens element is f3, afocal length of the fourth lens element is f4, a focal length of thefifth lens element is f5, and a focal length of the sixth lens elementis f6, the following condition is satisfied:(|f/f1|+|f/f3|+|f/f5|)/(|f/f2|+|f/f4|+|f/f6|)<1.0. Therefore, it isfavorable for balancing the refractive power distribution of thephotographing lens assembly so as to provide a better aberrationcorrection capability and to reduce the sensitivity. Preferably, thefollowing condition can be satisfied:(|f/f1|+|f/f3|+|f/f5|)/(|f/f2|+|f/f4|+|f/f6|)<0.55. More preferably, thefollowing condition can also be satisfied:(|f/f1|+|f/f3|+|f/f5|)/(|f/f2|+|f/f4|+|f/f6|)<0.45.

According to the present disclosure, the photographing lens assemblyfurther includes an aperture stop. When an axial distance between theaperture stop and the image-side surface of the sixth lens element isSD, and an axial distance between an object-side surface of the firstlens element and the image-side surface of the sixth lens element is TD,the following condition can be satisfied: 0.72<SD/TD<1.0. Therefore,adjusting the position of the aperture stop with respect to the six lenselements is favorable for balancing between the field of view and thetotal track length, such that the photographing lens assembly is moreapplicable to various applications. Preferably, the following conditioncan also be satisfied: 0.72<SD/TD<0.95.

When the focal length of the photographing lens assembly is f, and acurvature radius of an image-side surface of the fifth lens element isR10, the following condition can be satisfied: −0.90<f/R10<9.0.Therefore, it is favorable for balancing the refractive powerdistribution on the image side of the photographing lens assembly so asto prevent a total reflection due to an overly large incident angle onthe surfaces of the lens elements. Preferably, the following conditioncan be satisfied: −0.60<f/R10<3.0. More preferably, the followingcondition can also be satisfied: −0.40<f/R10<2.0.

When an axial distance between the object-side surface of the first lenselement and an image surface is TL, and the focal length of thephotographing lens assembly is f, the following condition can besatisfied: 1.70<TL/f<5.0. Therefore, it is favorable for obtaining abalance between the total track length and the field of view in order tominimize the total track length for various applications. Preferably,the following condition can be satisfied: 1.75<TL/f<3.0. Morepreferably, the following condition can also be satisfied:1.90<TL/f<2.60.

When a central thickness of the first lens element is CT1, and an axialdistance between the first lens element and the second lens element isT12, the following condition can be satisfied: 0.10<CT1/T12<3.3.Therefore, it is favorable for providing a retro-focus configuration onthe object side of the photographing lens assembly. Preferably, thefollowing condition can also be satisfied: 0.20<CT1/T12<1.0.

When an Abbe number of the sixth lens element is V6, and a refractiveindex of the sixth lens element is N6, the following condition can besatisfied: 7.0<V6/N6<33.0. Therefore, a large density difference existsbetween a high-dispersion material (low Abbe number) and air, and ithelps to obtain a stronger refractive capability, such that light isproperly refracted within a shorter distance, thereby reducing the sizeof the photographing lens assembly and improving the Petzval field.Preferably, the following condition can also be satisfied:10.0<V6/N6<25.0.

When the focal length of the fourth lens element is f4, and the focallength of the fifth lens element is f5, the following condition can besatisfied: |f4/f5|<2.0. Therefore, it is favorable for balancing therefractive power distribution so as to reduce the sensitivity of thephotographing lens assembly. Preferably, the following condition can besatisfied: |f4/f5|<1.0. More preferably, the following condition canalso be satisfied: |f4/f5|<0.55.

When a curvature radius of an object-side surface of the sixth lenselement is R11, and a curvature radius of the image-side surface of thesixth lens element is R12, the following condition can be satisfied:−3.50<(R11+R12)/(R11−R12)<2.50. Therefore, it is favorable for reducingthe incident angle and refraction angle on surfaces of the sixth lenselement so as to prevent stray light. Preferably, the followingcondition can be satisfied: −1.0<(R11+R12)/(R11−R12)<1.50. Morepreferably, the following condition can also be satisfied:0<(R11+R12)/(R11−R12)<1.30.

When a curvature radius of an object-side surface of the second lenselement is R3, and a curvature radius of the image-side surface of thesecond lens element is R4, the following condition can be satisfied:0<(R3+R4)/(R3−R4)<3.50. Therefore, it is favorable for controlling theshape of the second lens element and correcting the traveling directionof light rays with a large angle of view while improving peripheralimage quality. Preferably, the following condition can also besatisfied: 0.10<(R3+R4)/(R3−R4)<2.0.

When the focal length of the photographing lens assembly is f, the focallength of the first lens element is f1, and the focal length of thesecond lens element is f2, the following condition can be satisfied:|f2/f1|<0.60. Therefore, it is favorable for adjusting the refractivepower distribution of the first lens element and the second lens elementso as to provide a wider field of view. Preferably, the followingcondition can also be satisfied: |f2/f1|<0.40.

When a central thickness of the second lens element is CT2, and acentral thickness of the fourth lens element is CT4, the followingcondition can be satisfied: 1.05<CT4/CT2<3.0. Therefore, it is favorablefor balancing the thicknesses of the second lens element and the fourthlens element so as to reduce the converging distance of light rays andthereby reducing the total track length.

When half of a maximum field of view of the photographing lens assemblyis HFOV, the following condition can be satisfied: 1.20<tan(HFOV)<2.50.Therefore, controlling the field of view of the photographing lensassembly is favorable for providing a wider field of view and capturingmore image data.

When an axial distance between the second lens element and the thirdlens element is T23, an axial distance between the fourth lens elementand the fifth lens element is T45, the central thickness of the secondlens element is CT2, and the central thickness of the fourth lenselement is CT4, the following condition can be satisfied:0<(T23+T45)/(CT2+CT4)<0.20. Therefore, it is favorable for obtaining aproper space arrangement of the photographing lens assembly, whichallows the lens elements to have proper spacing among lens elements andhelps to correct aberrations.

When the axial distance between the fourth lens element and the fifthlens element is T45, an axial distance between the fifth lens elementand the sixth lens element is T56, and the central thickness of thefourth lens element is CT4, the following condition can be satisfied:(T45+T56)/CT4<1.0. Therefore, it is favorable for obtaining a balancebetween the thicknesses of the lens elements and the axial distancesbetween every adjacent lens element on the image side of thephotographing lens assembly so as to ensure that the lens elements aretightly arranged, thereby controlling the length of the barrel member.Preferably, the following condition can be satisfied:(T45+T56)/CT4<0.55. More preferably, the following condition can also besatisfied: (T45+T56)/CT4<0.35.

When the axial distance between the object-side surface of the firstlens element and the image surface is TL, and a maximum image height ofthe photographing lens assembly (half of a diagonal length of aneffective photosensitive area of an image sensor) is ImgH, the followingcondition can be satisfied: 1.0<TL/ImgH<2.0. Therefore, it is favorablefor miniaturizing the photographing lens assembly and having asufficient range of light capture for increasing image brightness.

When the focal length of the photographing lens assembly is f, and anentrance pupil diameter of the photographing lens assembly is EPD, thefollowing condition can be satisfied: 1.20<f/EPD<2.30. Therefore, it isfavorable for increasing the amount of incident light so as to increaseilluminance for obtaining a much clearer image. Preferably, thefollowing condition can also be satisfied: 1.20<f/EPD<2.10.

When an Abbe number of the third lens element is V3, and a refractiveindex of the third lens element is N3, the following condition can besatisfied: 10.0<V3/N3<15.0. Therefore, it is favorable for increasingthe density difference between the third lens element and air so as toenhance the capability of correcting chromatic aberration of the thirdlens element.

When the axial distance between the object-side surface of the firstlens element and the image surface is TL, the maximum image height ofthe photographing lens assembly is ImgH, and the entrance pupil diameterof the photographing lens assembly is EPD, the following condition canbe satisfied: 4.0<TL²/(ImgH×EPD)<8.30. Therefore, it is favorable forhaving a sufficiently large entrance pupil and image size to increaseimage brightness. Furthermore, it is favorable for obtaining high imagequality and a high-end specification in a limited and short space,making the photographing lens assembly to be more applicable.

When the focal length of the second lens element is f2, and the focallength of the fifth lens element is f5, the following condition can besatisfied: |f2/f5|<0.95. Therefore, it is favorable for adjusting therefractive power distribution of the second lens element and the fifthlens element so as to strengthen light converging power on the objectside of the photographing lens assembly, thereby obtaining compactness.Preferably, the following condition can also be satisfied: |f2/f5|<0.50.

When the focal length of the photographing lens assembly is f, acurvature radius of an object-side surface of one lens element of thesix lens elements is Rf, and a curvature radius of an image-side surfaceof the lens element is Rr, the following condition can be satisfied:|f/Rf|+|f/Rr|<0.30. Therefore, it is favorable for reducing thecurvature of the lens element so as to configure the lens element as acorrection lens for correcting aberrations.

According to the present disclosure, the aperture stop can be locatedbetween the first lens element and the second lens element. When anaxial distance between the aperture stop and the object-side surface ofthe second lens element is Dsr3, and an axial distance between theaperture stop and the image-side surface of the second lens element isDsr4, the following condition can be satisfied: 0≤Dsr3/Dsr4<0.50.Therefore, it is favorable for balancing between a large angle of viewand a short total track length for more applications. Preferably, thefollowing condition can also be satisfied: 0≤Dsr3/Dsr4<0.15.

When the curvature radius of the object-side surface of the second lenselement is R3, the curvature radius of the image-side surface of thesecond lens element is R4, a curvature radius of an object-side surfaceof the fourth lens element is R7, and a curvature radius of theimage-side surface of the fourth lens element is R8, the followingcondition can be satisfied: |R4/R3|+|R8/R7|<0.85. Therefore, it isfavorable for balancing the shapes of the second lens element and thefourth lens element so as to enlarge the field of view and the imageheight, thereby having a larger light receiving area. Preferably, thefollowing condition can also be satisfied: |R4/R3|+|R8/R7|<0.65.

When the axial distance between the third lens element and the fourthlens element is T34, and the axial distance between the fourth lenselement and the fifth lens element is T45, the following condition canbe satisfied: 0<T45/T34<0.90. Therefore, it is favorable for adjustingthe axial distances between the lens elements so as to ensure thesymmetry and compact configuration of the photographing lens assembly.

According to the present disclosure, at least three of the first lenselement, the second lens element, the third lens element, the fourthlens element, the fifth lens element and the sixth lens element can bemade of plastic material. Therefore, it is favorable for reducing theweight of the photographing lens assembly, and increasing theflexibility in shape design of the lens elements, such that the size ofthe photographing lens assembly is reduced.

According to the present disclosure, the aforementioned features andconditions can be utilized in numerous combinations so as to achievecorresponding effects.

According to the present disclosure, the lens elements of thephotographing lens assembly can be made of either glass or plasticmaterial. When the lens elements are made of glass material, therefractive power distribution of the photographing lens assembly may bemore flexible. The glass lens element can either be made by grinding ormolding. When the lens elements are made of plastic material, themanufacturing cost can be effectively reduced. Furthermore, surfaces ofeach lens element can be arranged to be aspheric, which allows for morecontrol variables for eliminating aberrations thereof, the requirednumber of the lens elements can be reduced, and the total track lengthof the photographing lens assembly can be effectively shortened. Theaspheric surfaces may be formed by plastic injection molding or glassmolding.

According to the present disclosure, when a lens surface is aspheric, itmeans that the lens surface has an aspheric shape throughout itsoptically effective area, or a portion(s) thereof.

According to the present disclosure, each of an object-side surface andan image-side surface has a paraxial region and an off-axis region. Theparaxial region refers to the region of the surface where light raystravel close to the optical axis, and the off-axis region refers to theregion of the surface away from the paraxial region. Particularly,unless otherwise stated, when the lens element has a convex surface, itindicates that the surface is convex in the paraxial region thereof;when the lens element has a concave surface, it indicates that thesurface is concave in the paraxial region thereof. Moreover, when aregion of refractive power or focus of a lens element is not defined, itindicates that the region of refractive power or focus of the lenselement is in the paraxial region thereof.

According to the present disclosure, an inflection point is a point onthe surface of the lens element at which the surface changes fromconcave to convex, or vice versa.

According to the present disclosure, an image surface of thephotographing lens assembly, based on the corresponding image sensor,can be flat or curved, especially a curved surface being concave facingtowards the object side of the photographing lens assembly.

According to the present disclosure, an image correction unit, such as afield flattener, can be optionally disposed between the lens elementclosest to the image side of the photographing lens assembly and theimage surface for correction of aberrations such as field curvature. Theoptical properties of the image correction unit, such as curvature,thickness, index of refraction, position and surface shape (convex orconcave surface with spherical, aspheric, diffractive or Fresnel types),can be adjusted according to the design of an image capturing unit. Ingeneral, a preferable image correction unit is, for example, a thintransparent element having a concave object-side surface and a planarimage-side surface, and the thin transparent element is disposed nearthe image surface.

According to the present disclosure, the photographing lens assembly caninclude at least one stop, such as an aperture stop, a glare stop or afield stop. Said glare stop or said field stop is set for eliminatingthe stray light and thereby improving image quality thereof.

According to the present disclosure, an aperture stop can be configuredas a front stop or a middle stop. A front stop disposed between animaged object and the first lens element can provide a longer distancebetween an exit pupil of the photographing lens assembly and the imagesurface to produce a telecentric effect, and thereby improves theimage-sensing efficiency of an image sensor (for example, CCD or CMOS).A middle stop disposed between the first lens element and the imagesurface is favorable for enlarging the viewing angle of thephotographing lens assembly and thereby provides a wider field of viewfor the same.

According to the above description of the present disclosure, thefollowing specific embodiments are provided for further explanation.

1st Embodiment

FIG. 1 is a schematic view of an image capturing unit according to the1st embodiment of the present disclosure. FIG. 2 shows, in order fromleft to right, spherical aberration curves, astigmatic field curves anda distortion curve of the image capturing unit according to the 1stembodiment. In FIG. 1 , the image capturing unit includes thephotographing lens assembly (its reference numeral is omitted) of thepresent disclosure and an image sensor 190. The photographing lensassembly includes, in order from an object side to an image side, afirst lens element 110, an aperture stop 100, a second lens element 120,a stop 101, a third lens element 130, a fourth lens element 140, a fifthlens element 150, a sixth lens element 160, a filter 170 and an imagesurface 180. The photographing lens assembly includes six lens elements(110, 120, 130, 140, 150 and 160) with no additional lens elementdisposed between each of the adjacent six lens elements.

The first lens element 110 with negative refractive power has anobject-side surface 111 being concave in a paraxial region thereof andan image-side surface 112 being concave in a paraxial region thereof.The first lens element 110 is made of plastic material and has theobject-side surface 111 and the image-side surface 112 being bothaspheric.

The second lens element 120 with positive refractive power has anobject-side surface 121 being convex in a paraxial region thereof and animage-side surface 122 being convex in a paraxial region thereof. Thesecond lens element 120 is made of plastic material and has theobject-side surface 121 and the image-side surface 122 being bothaspheric.

The third lens element 130 with negative refractive power has anobject-side surface 131 being convex in a paraxial region thereof and animage-side surface 132 being concave in a paraxial region thereof. Thethird lens element 130 is made of plastic material and has theobject-side surface 131 and the image-side surface 132 being bothaspheric.

The fourth lens element 140 with positive refractive power has anobject-side surface 141 being concave in a paraxial region thereof andan image-side surface 142 being convex in a paraxial region thereof. Thefourth lens element 140 is made of plastic material and has theobject-side surface 141 and the image-side surface 142 being bothaspheric.

The fifth lens element 150 with positive refractive power has anobject-side surface 151 being concave in a paraxial region thereof andan image-side surface 152 being convex in a paraxial region thereof. Thefifth lens element 150 is made of plastic material and has theobject-side surface 151 and the image-side surface 152 being bothaspheric.

The sixth lens element 160 with negative refractive power has anobject-side surface 161 being convex in a paraxial region thereof and animage-side surface 162 being concave in a paraxial region thereof. Thesixth lens element 160 is made of plastic material and has theobject-side surface 161 and the image-side surface 162 being bothaspheric. The image-side surface 162 of the sixth lens element 160 hasat least one inflection point.

The filter 170 is made of glass material and located between the sixthlens element 160 and the image surface 180, and will not affect thefocal length of the photographing lens assembly. The image sensor 190 isdisposed on or near the image surface 180 of the photographing lensassembly.

The equation of the aspheric surface profiles of the aforementioned lenselements of the 1st embodiment is expressed as follows:

${{X(Y)} = {{\left( {Y^{2}/R} \right)/\left( {1 + {sqr{t\left( {1 - {\left( {1 + k} \right) \times \left( {Y/R} \right)^{2}}} \right)}}} \right)} + {\sum\limits_{i}{({Ai}) \times \left( Y^{i} \right)}}}},$where,

X is the relative distance between a point on the aspheric surfacespaced at a distance Y from an optical axis and the tangential plane atthe aspheric surface vertex on the optical axis;

Y is the vertical distance from the point on the aspheric surface to theoptical axis;

R is the curvature radius;

k is the conic coefficient; and

Ai is the i-th aspheric coefficient, and in the embodiments, i may be,but is not limited to, 4, 6, 8, 10, 12, 14, 16, 18 and 20.

In the photographing lens assembly of the image capturing unit accordingto the 1st embodiment, when a focal length of the photographing lensassembly is f, an f-number of the photographing lens assembly is Fno,and half of a maximum field of view of the photographing lens assemblyis HFOV, these parameters have the following values: f=2.33 millimeters(mm), Fno=2.00, HFOV=55.8 degrees (deg.).

When an Abbe number of the third lens element 130 is V3, and arefractive index of the third lens element 130 is N3, the followingcondition is satisfied: V3/N3=12.86.

When an Abbe number of the sixth lens element 160 is V6, and arefractive index of the sixth lens element 160 is N6, the followingcondition is satisfied: V6/N6=16.11.

When a central thickness of the first lens element 110 is CT1, and anaxial distance between the first lens element 110 and the second lenselement 120 is T12, the following condition is satisfied: CT1/T12=0.47.In this embodiment, an axial distance between two adjacent lens elementsis an air gap in a paraxial region between the two adjacent lenselements.

When a central thickness of the second lens element 120 is CT2, and acentral thickness of the fourth lens element 140 is CT4, the followingcondition is satisfied: CT4/CT2=1.71.

When an axial distance between the third lens element 130 and the fourthlens element 140 is T34, and an axial distance between the fourth lenselement 140 and the fifth lens element 150 is T45, the followingcondition is satisfied: T45/T34=0.14.

When the axial distance between the fourth lens element 140 and thefifth lens element 150 is T45, and an axial distance between the fifthlens element 150 and the sixth lens element 160 is T56, and the centralthickness of the fourth lens element 140 is CT4, the following conditionis satisfied: (T45+T56)/CT4=0.17.

When an axial distance between the second lens element 120 and the thirdlens element 130 is T23, the axial distance between the fourth lenselement 140 and the fifth lens element 150 is T45, the central thicknessof the second lens element 120 is CT2, and the central thickness of thefourth lens element 140 is CT4, the following condition is satisfied:(T23+T45)/(CT2+CT4)=0.051.

When the focal length of the photographing lens assembly is f, and acurvature radius of the image-side surface 152 of the fifth lens element150 is R10, the following condition is satisfied: f/R10=−0.119.

When a curvature radius of the object-side surface 121 of the secondlens element 120 is R3, and a curvature radius of the image-side surface122 of the second lens element 120 is R4, the following condition issatisfied: (R3+R4)/(R3−R4)=0.507.

When a curvature radius of the object-side surface 161 of the sixth lenselement 160 is R11, and a curvature radius of the image-side surface 162of the sixth lens element 160 is R12, the following condition issatisfied: (R11+R12)/(R11−R12)=1.036.

When the curvature radius of the object-side surface 121 of the secondlens element 120 is R3, the curvature radius of the image-side surface122 of the second lens element 120 is R4, a curvature radius of theobject-side surface 141 of the fourth lens element 140 is R7, and acurvature radius of the image-side surface 142 of the fourth lenselement 140 is R8, the following condition is satisfied:|R4/R3|+|R8/R7|=0.342.

When a focal length of the first lens element 110 is f1, and a focallength of the second lens element 120 is f2, the following condition issatisfied: |f2/f1|=0.31.

When the focal length of the second lens element 120 is f2, and a focallength of the fifth lens element 150 is f5, the following condition issatisfied: |f2/f5|=0.03.

When a focal length of the fourth lens element 140 is f4, and the focallength of the fifth lens element 150 is f5, the following condition issatisfied: |f4/f5|=0.03.

When the focal length of the photographing lens assembly is f, the focallength of the first lens element 110 is f1, the focal length of thesecond lens element 120 is f2, a focal length of the third lens element130 is f3, the focal length of the fourth lens element 140 is f4, thefocal length of the fifth lens element 150 is f5, and a focal length ofthe sixth lens element 160 is f6, the following condition is satisfied:(|f/f1|+|f/f3|+|f/f5|)/(|f/f2|+|f/f4|+|f/f6|)=0.23.

When the focal length of the photographing lens assembly is f, and anentrance pupil diameter of the photographing lens assembly is EPD, thefollowing condition is satisfied: f/EPD=2.00.

When half of the maximum field of view of the photographing lensassembly is HFOV, the following condition is satisfied: tan(HFOV)=1.47.

When an axial distance between the aperture stop 100 and the object-sidesurface 121 of the second lens element 120 is Dsr3, and an axialdistance between the aperture stop 100 and the image-side surface 122 ofthe second lens element 120 is Dsr4, the following condition issatisfied: Dsr3/Dsr4=0.01.

When an axial distance between the aperture stop 100 and the image-sidesurface 162 of the sixth lens element 160 is SD, and an axial distancebetween the object-side surface 111 of the first lens element 110 andthe image-side surface 162 of the sixth lens element 160 is TD, thefollowing condition is satisfied: SD/TD=0.83.

When an axial distance between the object-side surface 111 of the firstlens element 110 and the image surface 180 is TL, and the focal lengthof the photographing lens assembly is f, the following condition issatisfied: TL/f=2.18.

When the axial distance between the object-side surface 111 of the firstlens element 110 and the image surface 180 is TL, and a maximum imageheight of the photographing lens assembly is ImgH, the followingcondition is satisfied: TL/ImgH=1.69.

When the axial distance between the object-side surface 111 of the firstlens element 110 and the image surface 180 is TL, the maximum imageheight of the photographing lens assembly is ImgH, and the entrancepupil diameter of the photographing lens assembly is EPD, the followingcondition is satisfied: TL²/(ImgH×EPD)=7.39.

When the focal length of the photographing lens assembly is f, acurvature radius of an object-side surface of one lens element of thesix lens elements is Rf, and a curvature radius of an image-side surfaceof the lens element of the six lens elements is Rr, one lens element(the fifth lens element 150) in this embodiment satisfies the followingcondition: |f/Rf|+|f/Rr|<0.30. The values of |f/Rf|+|f/Rr| for the sixlens elements (110, 120, 130, 140, 150 and 160) are respectivelypresented in the following paragraph.

When the focal length of the photographing lens assembly is f, acurvature radius of the object-side surface 111 of the first lenselement 110 is R1, and a curvature radius of the image-side surface 112of the first lens element 110 is R2, the following condition issatisfied: |f/R1|+|f/R2|=0.66. When the curvature radius of theobject-side surface 121 of the second lens element 120 is R3, and thecurvature radius of the image-side surface 122 of the second lenselement 120 is R4, the following condition is satisfied:|f/R3|+|f/R4|=2.23. When a curvature radius of the object-side surface131 of the third lens element 130 is R5, and a curvature radius of theimage-side surface 132 of the third lens element 130 is R6, thefollowing condition is satisfied: |f/R5|+|f/R6|=2.41. When the curvatureradius of the object-side surface 141 of the fourth lens element 140 isR7, and the curvature radius of the image-side surface 142 of the fourthlens element 140 is R8, the following condition is satisfied:|f/R7|+|f/R8|=2.34. When a curvature radius of the object-side surface151 of the fifth lens element 150 is R9, and the curvature radius of theimage-side surface 152 of the fifth lens element 150 is R10, thefollowing condition is satisfied: |f/R9|+|f/R10|=0.19. When thecurvature radius of the object-side surface 161 of the sixth lenselement 160 is R11, and the curvature radius of the image-side surface162 of the sixth lens element 160 is R12, the following condition issatisfied: |f/R11|+|f/R12|=2.23.

The detailed optical data of the 1st embodiment are shown in Table 1 andthe aspheric surface data are shown in Table 2 below.

TABLE 1 1st Embodiment f = 2.33 mm, Fno = 2.00, HFOV = 55.8 deg.Curvature Focal Surface # Radius Thickness Material Index Abbe # Length0 Object Plano Infinity 1 Lens 1 −25.693 (ASP) 0.227 Plastic 1.545 56.1−6.44 2 4.075 (ASP) 0.488 3 Ape. Stop Plano −0.008 4 Lens 2 4.242 (ASP)0.756 Plastic 1.545 56.1 2.01 5 −1.386 (ASP) 0.035 6 Stop Plano 0.035 7Lens 3 2.814 (ASP) 0.200 Plastic 1.656 21.3 −4.95 8 1.464 (ASP) 0.256 9Lens 4 −65.757 (ASP) 1.293 Plastic 1.545 56.1 1.87 10 −1.011 (ASP) 0.03511 Lens 5 −33.333 (ASP) 0.296 Plastic 1.639 23.5 72.64 12 −19.463 (ASP)0.187 13 Lens 6 60.792 (ASP) 0.424 Plastic 1.614 26.0 −1.77 14 1.062(ASP) 0.500 15 Filter Plano 0.110 Glass 1.517 64.2 — 16 Plano 0.243 17Image Plano — Note: Reference wavelength is 587.6 nm (d-line). Aneffective radius of the stop 101 (Surface 6) is 0.870 mm.

TABLE 2 Aspheric Coefficients Surface # 1 2 4 5 7 8 k = 9.0000E+011.9760E+01 −9.1180E+00 −8.8715E−01 −3.1712E+01 −4.3691E+00 A4 =4.3994E−01 5.8740E−01 3.9881E−02 −2.0733E−02 −2.6351E−01 −3.5328E−01 A6= −3.7630E−01 −7.0037E−02 −7.1823E−02 6.4120E−02 6.9218E−01 8.7127E−01A8 = 2.7347E−01 −1.2312E+00 3.8298E−02 −7.1140E−01 −1.9220E+00−1.6493E+00 A10 = −2.1753E−03 4.5461E+00 −4.9735E−01 9.1183E−012.9614E+00 1.8847E+00 A12 = −1.5728E−01 −4.6228E+00 6.6906E−10−5.7706E−01 −2.8573E+00 −1.2536E+00 A14 = 5.6875E−02 5.4786E−01 —1.7420E−11 1.2538E+00 3.6813E−01 A16 = — 3.8578E−12 — — 5.5880E−124.9236E−11 Surface # 9 10 11 12 13 14 k = −9.9000E+01 −9.8957E−019.0000E+01 2.9575E+01 −9.9000E+01 −8.7230E−01 A4 = 3.8228E−02 1.9753E−01−1.8408E−01 −2.2018E−01 −1.8041E−01 −4.6704E−01 A6 = 2.3761E−02−4.8577E−02 6.6139E−01 6.1529E−01 −1.3187E−02 3.2943E−01 A8 =−1.3193E−01 −1.8941E−01 −1.0183E+00 −7.4007E−01 1.1218E−01 −1.8480E−01A10 = 2.3792E−01 2.5274E−01 7.8159E−01 4.5609E−01 −6.8069E−02 7.4590E−02A12 = −2.2170E−01 −1.5613E−01 −3.6565E−01 −1.5410E−01 1.9939E−02−2.1125E−02 A14 = 9.6377E−02 5.3546E−02 9.2431E−02 2.6967E−02−3.2330E−03 4.0323E−03 A16 = −1.6239E−02 −7.5850E−03 −8.6271E−03−1.5233E−03 2.7979E−04 −4.8921E−04 A18 = — — — −1.8454E−04 −1.0156E−053.3882E−05 A20 = — — — 2.2862E−05 — −1.0176E−06

In Table 1, the curvature radius, the thickness and the focal length areshown in millimeters (mm). Surface numbers 0-17 represent the surfacessequentially arranged from the object side to the image side along theoptical axis. In Table 2, k represents the conic coefficient of theequation of the aspheric surface profiles. A4-A20 represent the asphericcoefficients ranging from the 4th order to the 20th order. The tablespresented below for each embodiment are the corresponding schematicparameter and aberration curves, and the definitions of the tables arethe same as Table 1 and Table 2 of the 1st embodiment. Therefore, anexplanation in this regard will not be provided again.

2nd Embodiment

FIG. 3 is a schematic view of an image capturing unit according to the2nd embodiment of the present disclosure. FIG. 4 shows, in order fromleft to right, spherical aberration curves, astigmatic field curves anda distortion curve of the image capturing unit according to the 2ndembodiment. In FIG. 3 , the image capturing unit includes thephotographing lens assembly (its reference numeral is omitted) of thepresent disclosure and an image sensor 290. The photographing lensassembly includes, in order from an object side to an image side, afirst lens element 210, an aperture stop 200, a second lens element 220,a third lens element 230, a fourth lens element 240, a fifth lenselement 250, a sixth lens element 260, a filter 270 and an image surface280. The photographing lens assembly includes six lens elements (210,220, 230, 240, 250 and 260) with no additional lens element disposedbetween each of the adjacent six lens elements.

The first lens element 210 with negative refractive power has anobject-side surface 211 being concave in a paraxial region thereof andan image-side surface 212 being concave in a paraxial region thereof.The first lens element 210 is made of plastic material and has theobject-side surface 211 and the image-side surface 212 being bothaspheric.

The second lens element 220 with positive refractive power has anobject-side surface 221 being convex in a paraxial region thereof and animage-side surface 222 being convex in a paraxial region thereof. Thesecond lens element 220 is made of glass material and has theobject-side surface 221 and the image-side surface 222 being bothaspheric.

The third lens element 230 with negative refractive power has anobject-side surface 231 being convex in a paraxial region thereof and animage-side surface 232 being concave in a paraxial region thereof. Thethird lens element 230 is made of glass material and has the object-sidesurface 231 and the image-side surface 232 being both aspheric.

The fourth lens element 240 with positive refractive power has anobject-side surface 241 being concave in a paraxial region thereof andan image-side surface 242 being convex in a paraxial region thereof. Thefourth lens element 240 is made of plastic material and has theobject-side surface 241 and the image-side surface 242 being bothaspheric.

The fifth lens element 250 with positive refractive power has anobject-side surface 251 being convex in a paraxial region thereof and animage-side surface 252 being concave in a paraxial region thereof. Thefifth lens element 250 is made of plastic material and has theobject-side surface 251 and the image-side surface 252 being bothaspheric.

The sixth lens element 260 with negative refractive power has anobject-side surface 261 being convex in a paraxial region thereof and animage-side surface 262 being concave in a paraxial region thereof. Thesixth lens element 260 is made of plastic material and has theobject-side surface 261 and the image-side surface 262 being bothaspheric. The image-side surface 262 of the sixth lens element 260 hasat least one inflection point.

The filter 270 is made of glass material and located between the sixthlens element 260 and the image surface 280, and will not affect thefocal length of the photographing lens assembly. The image sensor 290 isdisposed on or near the image surface 280 of the photographing lensassembly.

The detailed optical data of the 2nd embodiment are shown in Table 3 andthe aspheric surface data are shown in Table 4 below.

TABLE 3 2nd Embodiment f = 2.21 mm, Fno = 2.15, HFOV = 54.8 deg.Curvature Focal Surface # Radius Thickness Material Index Abbe # Length0 Object Plano Infinity 1 Lens 1 −25.929 (ASP) 0.229 Plastic 1.545 56.1−6.34 2 3.998 (ASP) 0.490 3 Ape. Stop Plano −0.010 4 Lens 2 4.120 (ASP)0.760 Glass 1.547 53.6 2.00 5 −1.397 (ASP) 0.076 6 Lens 3 2.866 (ASP)0.201 Glass 1.673 32.1 −4.79 7 1.475 (ASP) 0.242 8 Lens 4 −80.902 (ASP)1.150 Plastic 1.545 56.1 1.93 9 −1.045 (ASP) 0.035 10 Lens 5 38.310(ASP) 0.297 Plastic 1.639 23.5 62.73 11 874.722 (ASP) 0.189 12 Lens 615.458 (ASP) 0.420 Plastic 1.566 37.4 −2.00 13 1.043 (ASP) 0.500 14Filter Plano 0.110 Glass 1.517 64.2 — 15 Plano 0.290 16 Image Plano —Note: Reference wavelength is 587.6 nm (d-line).

TABLE 4 Aspheric Coefficients Surface # 1 2 4 5 6 7 k = 9.0000E+011.4790E+01 −1.4515E+01 −1.4109E−01 −7.8528E+01 −6.0410E+00 A4 =4.4927E−01 5.9803E−01 3.7485E−02 −6.1588E−02 −3.0660E−01 −3.6587E−01 A6= −3.9651E−01 −6.2570E−02 −3.1390E−02 1.3974E−01 6.5919E−01 8.6775E−01A8 = 2.9186E−01 −1.2308E+00 −2.2921E−01 −5.9066E−01 −1.8792E+00−1.6476E+00 A10 = −7.0085E−03 4.5491E+00 −2.2022E−01 6.5918E−012.9665E+00 1.8887E+00 A12 = −1.6043E−01 −4.6228E+00 — −5.3381E−01−2.8573E+00 −1.2537E+00 A14 = 5.8921E−02 5.4787E−01 — −6.0610E−081.2538E+00 3.6812E−01 A16 = — — — — −6.1403E−10 −2.6860E−06 Surface # 89 10 11 12 13 k = −9.9000E+01 −7.4014E−01 2.0000E+01 −1.0000E+008.8899E+00 −9.0473E−01 A4 = 8.4902E−02 1.2308E−01 −2.5970E−01 1.5661E−027.2062E−02 −3.8445E−01 A6 = −6.6936E−03 1.1958E−03 8.5808E−01 4.1830E−01−1.1533E−01 2.8680E−01 A8 = −1.3590E−01 −1.8098E−01 −2.0933E+00−1.0680E+00 8.7873E−03 −2.1598E−01 A10 = 2.4743E−01 2.4823E−012.5892E+00 1.1953E+00 7.7721E−02 1.2283E−01 A12 = −2.2170E−01−1.5615E−01 −1.8472E+00 −7.5448E−01 −5.8865E−02 −4.5993E−02 A14 =9.6388E−02 5.3485E−02 6.9984E−01 2.8399E−01 1.8577E−02 1.0806E−02 A16 =−1.6238E−02 −7.6400E−03 −1.0720E−01 −6.3024E−02 −2.7560E−03 −1.5333E−03A18 = — — — 7.6023E−03 1.5828E−04 1.2022E−04 A20 = — — — −3.8420E−04 —−4.0059E−06

In the 2nd embodiment, the equation of the aspheric surface profiles ofthe aforementioned lens elements is the same as the equation of the 1stembodiment. Also, the definitions of these parameters shown in thefollowing table are the same as those stated in the 1st embodiment withcorresponding values for the 2nd embodiment, so an explanation in thisregard will not be provided again.

Moreover, these parameters can be calculated from Table 3 and Table 4 asthe following values and satisfy the following conditions:

2nd Embodiment f [mm] 2.21 |f4/f5| 0.03 Fno 2.15 (|f/f1| + |f/f3| +|f/f5|)/ 0.25 (|f/f2| + |f/f4| + |f/f6|) HFOV [deg.] 54.8 f/EPD 2.15V3/N3 19.19 tan (HFOV) 1.42 V6/N6 23.88 Dsr3/Dsr4 0.01 CT1/T12 0.48SD/TD 0.82 CT4/CT2 1.51 TL/f 2.25 T45/T34 0.14 TL/ImgH 1.66 (T45 +T56)/CT4 0.19 TL²/(ImgH × EPD) 8.02 (T23 + T45)/(CT2 + CT4) 0.058|f/R1| + |f/R2| 0.64 f/R10 0.003 |f/R3| + |f/R4| 2.12 (R3 + R4)/(R3 −R4) 0.493 |f/R5| + |f/R6| 2.27 (R11 + R12)/(R11 − R12) 1.145 |f/R7| +|f/R8| 2.15 |R4/R3| + |R8/R7| 0.352 |f/R9| + |f/R10| 0.06 |f2/f1| 0.32|f/R11| + |f/R12| 2.27 |f2/f5| 0.03 — —

3rd Embodiment

FIG. 5 is a schematic view of an image capturing unit according to the3rd embodiment of the present disclosure. FIG. 6 shows, in order fromleft to right, spherical aberration curves, astigmatic field curves anda distortion curve of the image capturing unit according to the 3rdembodiment. In FIG. 5 , the image capturing unit includes thephotographing lens assembly (its reference numeral is omitted) of thepresent disclosure and an image sensor 390. The photographing lensassembly includes, in order from an object side to an image side, afirst lens element 310, an aperture stop 300, a second lens element 320,a stop 301, a third lens element 330, a fourth lens element 340, a fifthlens element 350, a sixth lens element 360, a filter 370 and an imagesurface 380. The photographing lens assembly includes six lens elements(310, 320, 330, 340, 350 and 360) with no additional lens elementdisposed between each of the adjacent six lens elements.

The first lens element 310 with negative refractive power has anobject-side surface 311 being convex in a paraxial region thereof and animage-side surface 312 being concave in a paraxial region thereof. Thefirst lens element 310 is made of plastic material and has theobject-side surface 311 and the image-side surface 312 being bothaspheric.

The second lens element 320 with positive refractive power has anobject-side surface 321 being convex in a paraxial region thereof and animage-side surface 322 being convex in a paraxial region thereof. Thesecond lens element 320 is made of plastic material and has theobject-side surface 321 and the image-side surface 322 being bothaspheric.

The third lens element 330 with negative refractive power has anobject-side surface 331 being convex in a paraxial region thereof and animage-side surface 332 being concave in a paraxial region thereof. Thethird lens element 330 is made of plastic material and has theobject-side surface 331 and the image-side surface 332 being bothaspheric.

The fourth lens element 340 with positive refractive power has anobject-side surface 341 being convex in a paraxial region thereof and animage-side surface 342 being convex in a paraxial region thereof. Thefourth lens element 340 is made of plastic material and has theobject-side surface 341 and the image-side surface 342 being bothaspheric.

The fifth lens element 350 with negative refractive power has anobject-side surface 351 being convex in a paraxial region thereof and animage-side surface 352 being concave in a paraxial region thereof. Thefifth lens element 350 is made of plastic material and has theobject-side surface 351 and the image-side surface 352 being bothaspheric.

The sixth lens element 360 with negative refractive power has anobject-side surface 361 being concave in a paraxial region thereof andan image-side surface 362 being concave in a paraxial region thereof.The sixth lens element 360 is made of plastic material and has theobject-side surface 361 and the image-side surface 362 being bothaspheric. The image-side surface 362 of the sixth lens element 360 hasat least one inflection point.

The filter 370 is made of glass material and located between the sixthlens element 360 and the image surface 380, and will not affect thefocal length of the photographing lens assembly. The image sensor 390 isdisposed on or near the image surface 380 of the photographing lensassembly.

The detailed optical data of the 3rd embodiment are shown in Table 5 andthe aspheric surface data are shown in Table 6 below.

TABLE 5 3rd Embodiment f = 2.16 mm, Fno = 1.93 HFOV = 55.3 deg.Curvature Focal Surface # Radius Thickness Material Index Abbe # Length0 Object Plano Infinity 1 Lens 1 10.125 (ASP) 0.244 Plastic 1.545 56.1−5.19 2 2.192 (ASP) 0.482 3 Ape. Stop Plano −0.012 4 Lens 2 3.251 (ASP)0.741 Plastic 1.545 56.1 1.81 5 −1.297 (ASP) 0.005 6 Stop Plano 0.101 7Lens 3 9.833 (ASP) 0.200 Plastic 1.639 23.5 −3.32 8 1.728 (ASP) 0.116 9Lens 4 8.045 (ASP) 1.399 Plastic 1.545 56.1 1.57 10 −0.896 (ASP) 0.06711 Lens 5 80.405 (ASP) 0.255 Plastic 1.639 23.3 −15.68 12 8.893 (ASP)0.322 13 Lens 6 −11.248 (ASP) 0.230 Plastic 1.582 30.2 −1.78 14 1.150(ASP) 0.500 15 Filter Plano 0.110 Glass 1.517 64.2 — 16 Plano 0.141 17Image Plano — Note: Reference wavelength is 587.6 nm (d-line). Aneffective radius of the stop 301 (Surface 6) is 0.860 mm.

TABLE 6 Aspheric Coefficients Surface # 1 2 4 5 7 8 k=   1.5636E+01  5.7058E+00 −7.4523E+00 −1.3897E+00 −2.0058E+01 −3.4889E+00 A4=  4.0841E−01   5.5851E−01   2.4646E−02 −6.1542E−03 −3.2244E−01−3.5304E−01 A6= −4.2808E−01 −7.0390E−02 −6.8656E−02 −1.7370E−01  7.5848E−01   8.7392E−01 A8=   6.5105E−01 −1.0826E+00 −3.2364E−02−4.5024E−01 −1.9737E+00 −1.5831E+00 A10= −6.9813E−01   5.0779E+00−4.1944E−01   9.5840E−01   3.0299E+00   1.8590E+00 A12=   4.8785E−01−4.6228E+00 −8.7357E−11 −8.0398E−01 −2.8635E+00 −1.2532E+00 A14=−1.7642E−01   5.4786E−01 —   3.1247E−04   1.2539E+00   3.6514E−01 A16= —−3.4633E−15 — — −2.2626E−12   1.7405E−05 Surface # 9 10 11 12 13 14 k=  4.2604E+01 −1.3012E+00 −9.0475E+01 −8.7748E+01   1.3487E+01−8.6854E−01 A4=   8.1778E−03   2.1389E−01 −4.4793E−01 −5.3725E−01−1.1062E−01 −3.5093E−01 A6=   3.9849E−02 −6.0693E−02   1.5498E+00  1.4563E+00 −2.7528E−02   1.5144E−01 A8= −1.3472E−01 −1.9202E−01−2.4504E+00 −1.7295E+00   8.1728E−02 −2.7372E−02 A10=   2.4203E−01  2.5361E−01   2.2426E+00   1.1438E+00 −4.4483E−02 −1.4571E−02 A12=−2.2464E−01 −1.5550E−01 −1.3031E+00 −4.6730E−01   1.2216E−02  1.1327E−02 A14=   9.4373E−02   5.3770E−02   4.3193E−01   1.2180E−01−1.8858E−03 −3.4191E−03 A16= −1.3580E−02 −7.6137E−03 −6.2258E−02−1.9861E−02   1.5663E−04   5.4520E−04 A18= — — —   1.8550E−03−5.4800E−06 −4.4920E−05 A20= — — — −7.6008E−05 —   1.5020E−06

In the 3rd embodiment, the equation of the aspheric surface profiles ofthe aforementioned lens elements is the same as the equation of the 1stembodiment. Also, the definitions of these parameters shown in thefollowing table are the same as those stated in the 1st embodiment withcorresponding values for the 3rd embodiment, so an explanation in thisregard will not be provided again.

Moreover, these parameters can be calculated from Table 5 and Table 6 asthe following values and satisfy the following conditions:

3rd Embodiment f [mm] 2.16 |f4/f5| 0.10 Fno 1.93 (|f/f1| + |f/f3| +|f/f5|)/ 0.32 (|f/f2| + |f/f4| + |f/f6|) HFOV [deg.] 55.3 f/EPD 1.93V3/N3 14.34 tan (HFOV) 1.44 V6/N6 19.09 Dsr3/Dsr4 0.02 CT1/T12 0.52SD/TD 0.83 CT4/CT2 1.89 TL/f 2.27 T45/T34 0.58 TL/ImgH 1.63 (T45 +T56)/CT4 0.28 TL²/(ImgH × EPD) 7.15 (T23 + T45)/(CT2 + CT4) 0.081|f/R1| + |f/R2| 1.20 f/R10 0.243 |f/R3| + |f/R4| 2.33 (R3 + R4)/(R3 −R4) 0.429 |f/R5| + |f/R6| 1.47 (R11 + R12)/(R11 − R12) 0.815 |f/R7| +|f/R8| 2.68 |R4/R3| + |R8/R7| 0.511 |f/R9| + |f/R10| 0.27 |f2/f1| 0.35|f/R11| + |f/R12| 2.07 |f2/f5| 0.12 — —

4th Embodiment

FIG. 7 is a schematic view of an image capturing unit according to the4th embodiment of the present disclosure. FIG. 8 shows, in order fromleft to right, spherical aberration curves, astigmatic field curves anda distortion curve of the image capturing unit according to the 4thembodiment. In FIG. 7 , the image capturing unit includes thephotographing lens assembly (its reference numeral is omitted) of thepresent disclosure and an image sensor 490. The photographing lensassembly includes, in order from an object side to an image side, afirst lens element 410, an aperture stop 400, a second lens element 420,a stop 401, a third lens element 430, a fourth lens element 440, a fifthlens element 450, a sixth lens element 460, a filter 470 and an imagesurface 480. The photographing lens assembly includes six lens elements(410, 420, 430, 440, 450 and 460) with no additional lens elementdisposed between each of the adjacent six lens elements.

The first lens element 410 with negative refractive power has anobject-side surface 411 being convex in a paraxial region thereof and animage-side surface 412 being concave in a paraxial region thereof. Thefirst lens element 410 is made of plastic material and has theobject-side surface 411 and the image-side surface 412 being bothaspheric.

The second lens element 420 with positive refractive power has anobject-side surface 421 being concave in a paraxial region thereof andan image-side surface 422 being convex in a paraxial region thereof. Thesecond lens element 420 is made of plastic material and has theobject-side surface 421 and the image-side surface 422 being bothaspheric.

The third lens element 430 with negative refractive power has anobject-side surface 431 being convex in a paraxial region thereof and animage-side surface 432 being concave in a paraxial region thereof. Thethird lens element 430 is made of plastic material and has theobject-side surface 431 and the image-side surface 432 being bothaspheric.

The fourth lens element 440 with positive refractive power has anobject-side surface 441 being convex in a paraxial region thereof and animage-side surface 442 being convex in a paraxial region thereof. Thefourth lens element 440 is made of plastic material and has theobject-side surface 441 and the image-side surface 442 being bothaspheric.

The fifth lens element 450 with negative refractive power has anobject-side surface 451 being convex in a paraxial region thereof and animage-side surface 452 being concave in a paraxial region thereof. Thefifth lens element 450 is made of plastic material and has theobject-side surface 451 and the image-side surface 452 being bothaspheric.

The sixth lens element 460 with negative refractive power has anobject-side surface 461 being concave in a paraxial region thereof andan image-side surface 462 being concave in a paraxial region thereof.The sixth lens element 460 is made of plastic material and has theobject-side surface 461 and the image-side surface 462 being bothaspheric. The image-side surface 462 of the sixth lens element 460 hasat least one inflection point.

The filter 470 is made of glass material and located between the sixthlens element 460 and the image surface 480, and will not affect thefocal length of the photographing lens assembly. The image sensor 490 isdisposed on or near the image surface 480 of the photographing lensassembly.

The detailed optical data of the 4th embodiment are shown in Table 7 andthe aspheric surface data are shown in Table 8 below.

TABLE 7 4th Embodiment f = 2.24 mm, Fno = 1.93, HFOV = 53.7 deg. FocalSurface # Curvature Radius Thickness Material Index Abbe # Length 0Object Plano Infinity 1 Lens 1 12.370 (ASP) 0.257 Plastic 1.582 30.2−9.80 2 3.875 (ASP) 0.321 3 Ape. Stop Plano 0.042 4 Lens 2 −31.097 (ASP)0.684 Plastic 1.545 56.1 2.13 5 −1.129 (ASP) 0.015 6 Stop Plano 0.055 7Lens 3 3.078 (ASP) 0.214 Plastic 1.639 23.5 −3.98 8 1.355 (ASP) 0.159 9Lens 4 9.524 (ASP) 1.545 Plastic 1.545 56.1 1.51 10 −0.851 (ASP) 0.04011 Lens 5 7.485 (ASP) 0.214 Plastic 1.650 21.5 −9.11 12 3.270 (ASP)0.335 13 Lens 6 −18.453 (ASP) 0.230 Plastic 1.582 30.2 −1.75 14 1.084(ASP) 0.500 15 Filter Plano 0.110 Glass 1.517 64.2 — 16 Plano 0.142 17Image Plano — Note: Reference wavelength is 587.6 nm (d-line). Aneffective radius of the stop 401 (Surface 6) is 0.900 mm.

TABLE 8 Aspheric Coefficients Surface # 1 2 4 5 7 8 k=   2.1774E+01  6.2448E+00 −2.0058E+01 −1.4266E+00 −1.4072E+01 −4.5187E+00 A4=  3.6464E−01   5.3204E−01 −2.8475E−02 −1.0727E−02 −3.3921E−01−3.6941E−01 A6= −3.6719E−01   4.7436E−02 −9.9373E−02 −2.3147E−01  7.0678E−01   8.6355E−01 A8=   8.0671E−01 −1.0631E+00 −1.0696E−01−3.3235E−01 −1.8382E+00 −1.5974E+00 A10= −1.1491E+00   5.1729E+00−8.6371E−01   6.9569E−01   3.0299E+00   1.8494E+00 A12=   1.0536E+00−4.6228E+00 −8.7391E−11 −8.0398E−01 −2.9700E+00 −1.2364E+00 A14=−4.2910E−01   5.4786E−01 —   3.1247E−04   1.2539E+00   3.4867E−01 A16= —−3.4646E−15 — — −2.2621E−12   1.7405E−05 Surface # 9 10 11 12 13 14 k=  3.9603E+01 −1.3573E+00 −9.0475E+01 −4.9671E+01   4.2970E+01−8.7403E−01 A4=   4.8561E−02   2.1403E−01 −6.2349E−01 −6.3276E−01−8.6997E−02 −3.8844E−01 A6=   3.9365E−02 −6.3246E−02   1.8254E+00  1.6941E+00 −4.7631E−02   2.1871E−01 A8= −1.4572E−01 −1.8746E−01−2.5582E+00 −2.0709E+00   9.2921E−02 −9.7630E−02 A10=   2.3568E−01  2.5574E−01   2.0147E+00   1.4508E+00 −5.0978E−02   2.7945E−02 A12=−2.1624E−01 −1.5519E−01 −9.6366E−01 −6.3842E−01   1.4769E−02 −4.5984E−03A14=   9.5762E−02   5.3457E−02   2.5709E−01   1.8017E−01 −2.4389E−03  3.1311E−04 A16= −1.5742E−02 −8.0528E−03 −2.9902E−02 −3.1688E−02  2.1710E−04   1.6813E−05 A18= — — —   3.1610E−03 −8.1030E−06−3.8523E−06 A20= — — — −1.3653E−04 —   1.6205E−07

In the 4th embodiment, the equation of the aspheric surface profiles ofthe aforementioned lens elements is the same as the equation of the 1stembodiment. Also, the definitions of these parameters shown in thefollowing table are the same as those stated in the 1st embodiment withcorresponding values for the 4th embodiment, so an explanation in thisregard will not be provided again.

Moreover, these parameters can be calculated from Table 7 and Table 8 asthe following values and satisfy the following conditions:

4th Embodiment f [mm] 2.24 |f4/f5| 0.17 Fno 1.93 (|f/f1| + |f/f3| +|f/f5|)/ 0.27 (|f/f2| + |f/f4| + |f/f6|) HFOV [deg.] 53.7 f/EPD 1.93V3/N3 14.34 tan (HFOV) 1.36 V6/N6 19.09 Dsr3/Dsr4 0.06 CT1/T12 0.71SD/TD 0.86 CT4/CT2 2.26 TL/f 2.17 T45/T34 0.25 TL/ImgH 1.68 (T45 +T56)/CT4 0.24 TL²/(ImgH × EPD) 7.04 (T23 + T45)/(CT2 + CT4) 0.049|f/R1| + |f/R2| 0.76 f/R10 0.684 |f/R3| + |f/R4| 2.05 (R3 + R4)/(R3 −R4) 1.075 |f/R5| + |f/R6| 2.38 (R11 + R12)/(R11 − R12) 0.889 |f/R7| +|f/R8| 2.86 |R4/R3| + |R8/R7| 0.126 |f/R9| + |f/R10| 0.98 |f2/f1| 0.22|f/R11| + |f/R12| 2.18 |f2/f5| 0.23 — —

5th Embodiment

FIG. 9 is a schematic view of an image capturing unit according to the5th embodiment of the present disclosure. FIG. 10 shows, in order fromleft to right, spherical aberration curves, astigmatic field curves anda distortion curve of the image capturing unit according to the 5thembodiment. In FIG. 9 , the image capturing unit includes thephotographing lens assembly (its reference numeral is omitted) of thepresent disclosure and an image sensor 590. The photographing lensassembly includes, in order from an object side to an image side, afirst lens element 510, an aperture stop 500, a second lens element 520,a stop 501, a third lens element 530, a fourth lens element 540, a fifthlens element 550, a sixth lens element 560, a filter 570 and an imagesurface 580. The photographing lens assembly includes six lens elements(510, 520, 530, 540, 550 and 560) with no additional lens elementdisposed between each of the adjacent six lens elements.

The first lens element 510 with positive refractive power has anobject-side surface 511 being concave in a paraxial region thereof andan image-side surface 512 being convex in a paraxial region thereof. Thefirst lens element 510 is made of plastic material and has theobject-side surface 511 and the image-side surface 512 being bothaspheric.

The second lens element 520 with positive refractive power has anobject-side surface 521 being concave in a paraxial region thereof andan image-side surface 522 being convex in a paraxial region thereof. Thesecond lens element 520 is made of plastic material and has theobject-side surface 521 and the image-side surface 522 being bothaspheric.

The third lens element 530 with negative refractive power has anobject-side surface 531 being convex in a paraxial region thereof and animage-side surface 532 being concave in a paraxial region thereof. Thethird lens element 530 is made of plastic material and has theobject-side surface 531 and the image-side surface 532 being bothaspheric.

The fourth lens element 540 with positive refractive power has anobject-side surface 541 being concave in a paraxial region thereof andan image-side surface 542 being convex in a paraxial region thereof. Thefourth lens element 540 is made of plastic material and has theobject-side surface 541 and the image-side surface 542 being bothaspheric.

The fifth lens element 550 with negative refractive power has anobject-side surface 551 being convex in a paraxial region thereof and animage-side surface 552 being concave in a paraxial region thereof. Thefifth lens element 550 is made of plastic material and has theobject-side surface 551 and the image-side surface 552 being bothaspheric.

The sixth lens element 560 with negative refractive power has anobject-side surface 561 being convex in a paraxial region thereof and animage-side surface 562 being concave in a paraxial region thereof. Thesixth lens element 560 is made of plastic material and has theobject-side surface 561 and the image-side surface 562 being bothaspheric. The image-side surface 562 of the sixth lens element 560 hasat least one inflection point.

The filter 570 is made of glass material and located between the sixthlens element 560 and the image surface 580, and will not affect thefocal length of the photographing lens assembly. The image sensor 590 isdisposed on or near the image surface 580 of the photographing lensassembly.

The detailed optical data of the 5th embodiment are shown in Table 9 andthe aspheric surface data are shown in Table 10 below.

TABLE 9 5th Embodiment f = 1.92 mm, Fno = 2.00, HFOV = 52.5 deg. FocalSurface # Curvature Radius Thickness Material Index Abbe # Length 0Object Plano Infinity 1 Lens 1 −15.614 (ASP) 0.262 Plastic 1.545 56.1836.02 2 −15.186 (ASP) 0.368 3 Ape. Stop Plano 0.034 4 Lens 2 −13.818(ASP) 0.652 Plastic 1.545 56.1 2.39 5 −1.212 (ASP) −0.015 6 Stop Plano0.085 7 Lens 3 3.703 (ASP) 0.205 Plastic 1.639 23.5 −4.13 8 1.506 (ASP)0.155 9 Lens 4 −232.470 (ASP) 1.240 Plastic 1.545 56.1 1.36 10 −0.738(ASP) 0.120 11 Lens 5 1.671 (ASP) 0.204 Plastic 1.650 21.5 −5.14 121.061 (ASP) 0.203 13 Lens 6 23.224 (ASP) 0.230 Plastic 1.582 30.2 −1.8914 1.048 (ASP) 0.350 15 Filter Plano 0.110 Glass 1.517 64.2 — 16 Plano0.186 17 Image Plano — Note: Reference wavelength is 587.6 nm (d-line).An effective radius of the stop 501 (Surface 6) is 0.844 mm.

TABLE 10 Aspheric Coefficients Surface # 1 2 4 5 7 8 k=   1.6668E+01  7.4740E+00   2.1774E+01 −1.6775E+00 −1.6969E+01 −4.0177E+00 A4=  3.0692E−01   5.5115E−01 −2.2751E−02   1.5699E−02 −3.4189E−01−3.8884E−01 A6= −4.5888E−01 −2.0363E+00 −1.1043E−01 −1.2671E−01  6.8436E−01   8.4235E−01 A8=   1.2231E+00   1.1281E+01 −1.6901E−01−5.9493E−01 −1.9825E+00 −1.5980E+00 A10= −1.9731E+00 −3.6869E+01−1.2965E+00   9.0509E−01   3.0299E+00   1.8564E+00 A12=   1.7088E+00  6.7909E+01 −8.7535E−11 −8.0398E−01 −2.7931E+00 −1.2235E+00 A14=−5.9055E−01 −6.3284E+01 —   3.1247E−04   1.2539E+00   3.4826E−01 A16= —  2.2732E+01 — — −2.2572E−12   1.7405E−05 Surface # 9 10 11 12 13 14 k=  9.0000E+01 −1.2225E+00 −9.0475E+01 −2.4542E+01   8.9860E+01−8.4534E−01 A4=   3.5121E−02   1.8362E−01 −4.4642E−01 −4.0186E−01−8.2495E−02 −4.4030E−01 A6=   3.6806E−02 −7.4792E−02   1.0747E+00  1.0519E+00 −2.8599E−02   3.0696E−01 A8= −1.4983E−01 −1.8769E−01−1.4619E+00 −1.4215E+00   6.9185E−02 −1.7982E−01 A10=   2.3455E−01  2.5607E−01   1.0080E+00   1.1110E+00 −3.9560E−02   6.7454E−02 A12=−2.1679E−01 −1.5533E−01 −3.8135E−01 −5.5305E−01   1.2138E−02 −1.3016E−02A14=   9.4519E−02   5.3323E−02   6.1341E−02   1.7967E−01 −2.1706E−03  2.5405E−04 A16= −1.2763E−02 −8.0549E−03   1.0813E−04 −3.6857E−02  2.1312E−04   3.7344E−04 A18= — — —   4.3115E−03 −8.8968E−06−6.2608E−05 A20= — — — −2.1799E−04 —   3.2100E−06

In the 5th embodiment, the equation of the aspheric surface profiles ofthe aforementioned lens elements is the same as the equation of the 1stembodiment. Also, the definitions of these parameters shown in thefollowing table are the same as those stated in the 1st embodiment withcorresponding values for the 5th embodiment, so an explanation in thisregard will not be provided again.

Moreover, these parameters can be calculated from Table 9 and Table 10as the following values and satisfy the following conditions:

5th Embodiment f [mm] 1.92 |f4/f5| 0.26 Fno 2.00 (|f/f1| + |f/f3| +|f/f5|)/ 0.26 (|f/f2| + |f/f4| + |f/f6|) HFOV [deg.] 52.5 f/EPD 2.00V3/N3 14.34 tan (HFOV) 1.30 V6/N6 19.09 Dsr3/Dsr4 0.05 CT1/T12 0.65SD/TD 0.83 CT4/CT2 1.90 TL/f 2.29 T45/T34 0.77 TL/ImgH 1.92 (T45 +T56)/CT4 0.26 TL²/(ImgH × EPD) 8.80 (T23 + T45)/(CT2 + CT4) 0.100|f/R1| + |f/R2| 0.25 f/R10 1.808 |f/R3| + |f/R4| 1.72 (R3 + R4)/(R3 −R4) 1.192 |f/R5| + |f/R6| 1.79 (R11 + R12)/(R11 − R12) 1.095 |f/R7| +|f/R8| 2.61 |R4/R3| + |R8/R7| 0.091 |f/R9| + |f/R10| 2.96 |f2/f1| 0.0029|f/R11| + |f/R12| 1.91 |f2/f5| 0.47 — —

6th Embodiment

FIG. 11 is a schematic view of an image capturing unit according to the6th embodiment of the present disclosure. FIG. 12 shows, in order fromleft to right, spherical aberration curves, astigmatic field curves anda distortion curve of the image capturing unit according to the 6thembodiment. In FIG. 11 , the image capturing unit includes thephotographing lens assembly (its reference numeral is omitted) of thepresent disclosure and an image sensor 690. The photographing lensassembly includes, in order from an object side to an image side, afirst lens element 610, an aperture stop 600, a second lens element 620,a stop 601, a third lens element 630, a fourth lens element 640, a fifthlens element 650, a sixth lens element 660, a filter 670 and an imagesurface 680. The photographing lens assembly includes six lens elements(610, 620, 630, 640, 650 and 660) with no additional lens elementdisposed between each of the adjacent six lens elements.

The first lens element 610 with negative refractive power has anobject-side surface 611 being concave in a paraxial region thereof andan image-side surface 612 being convex in a paraxial region thereof. Thefirst lens element 610 is made of plastic material and has theobject-side surface 611 and the image-side surface 612 being bothaspheric.

The second lens element 620 with positive refractive power has anobject-side surface 621 being convex in a paraxial region thereof and animage-side surface 622 being convex in a paraxial region thereof. Thesecond lens element 620 is made of plastic material and has theobject-side surface 621 and the image-side surface 622 being bothaspheric.

The third lens element 630 with positive refractive power has anobject-side surface 631 being convex in a paraxial region thereof and animage-side surface 632 being concave in a paraxial region thereof. Thethird lens element 630 is made of plastic material and has theobject-side surface 631 and the image-side surface 632 being bothaspheric.

The fourth lens element 640 with positive refractive power has anobject-side surface 641 being concave in a paraxial region thereof andan image-side surface 642 being convex in a paraxial region thereof. Thefourth lens element 640 is made of plastic material and has theobject-side surface 641 and the image-side surface 642 being bothaspheric.

The fifth lens element 650 with negative refractive power has anobject-side surface 651 being convex in a paraxial region thereof and animage-side surface 652 being concave in a paraxial region thereof. Thefifth lens element 650 is made of plastic material and has theobject-side surface 651 and the image-side surface 652 being bothaspheric.

The sixth lens element 660 with negative refractive power has anobject-side surface 661 being convex in a paraxial region thereof and animage-side surface 662 being concave in a paraxial region thereof. Thesixth lens element 660 is made of plastic material and has theobject-side surface 661 and the image-side surface 662 being bothaspheric. The image-side surface 662 of the sixth lens element 660 hasat least one inflection point.

The filter 670 is made of glass material and located between the sixthlens element 660 and the image surface 680, and will not affect thefocal length of the photographing lens assembly. The image sensor 690 isdisposed on or near the image surface 680 of the photographing lensassembly.

The detailed optical data of the 6th embodiment are shown in Table 11and the aspheric surface data are shown in Table 12 below.

TABLE 11 6th Embodiment f = 1.77 mm, Fno = 2.00, HFOV = 54.7 deg. FocalSurface # Curvature Radius Thickness Material Index Abbe # Length 0Object Plano Infinity 1 Lens 1 −11.129 (ASP) 0.274 Plastic 1.545 56.1−48.70 2 −19.333 (ASP) 0.379 3 Ape. Stop Plano 0.039 4 Lens 2 74.265(ASP) 0.629 Plastic 1.545 56.1 3.27 5 −1.822 (ASP) 0.075 6 Stop Plano0.075 7 Lens 3 1.497 (ASP) 0.208 Plastic 1.639 23.5 13.87 8 1.704 (ASP)0.176 9 Lens 4 −3.775 (ASP) 0.846 Plastic 1.545 56.1 1.42 10 −0.692(ASP) 0.035 11 Lens 5 1.694 (ASP) 0.231 Plastic 1.650 21.5 −4.20 120.990 (ASP) 0.158 13 Lens 6 19.031 (ASP) 0.230 Plastic 1.582 30.2 −1.9314 1.054 (ASP) 0.350 15 Filter Plano 0.110 Glass 1.517 64.2 — 16 Plano0.194 17 Image Plano — Note: Reference wavelength is 587.6 nm (d-line).An effective radius of the stop 601 (Surface 6) is 0.870 mm.

TABLE 12 Aspheric Coefficients Surface # 1 2 4 5 7 8 k= −2.0058E+01  7.4740E+00 −2.0058E+01   3.3078E+00 −1.6301E+01 −2.9353E+00 A4=  3.2964E−01   6.2670E−01 −1.1285E−01 −4.5722E−01 −3.4230E−01−3.9796E−01 A6= −3.8834E−01 −2.1490E+00 −1.7335E−01   7.0544E−01  6.9374E−01   8.2089E−01 A8=   7.4583E−01   1.1204E+01 −2.0143E−01−6.6243E−01 −1.9883E+00 −1.5986E+00 A10= −9.7144E−01 −3.6107E+01−3.3809E+00 −5.5453E−02   3.0299E+00   1.8687E+00 A12=   7.5945E−01  6.7769E+01 −8.6427E−11 −8.0398E−01 −2.8513E+00 −1.2161E+00 A14=−2.5170E−01 −6.5635E+01 —   3.1247E−04   1.2539E+00   3.4299E−01 A16= —  2.4766E+01 — — −2.2650E−12   1.7405E−05 Surface # 9 10 11 12 13 14 k=−1.3749E+01 −1.4275E+00 −9.0475E+01 −1.9741E+01   6.6999E+01 −8.4468E−01A4=   3.3377E−02   1.4372E−01 −4.0179E−01 −2.7696E−01 −7.7952E−02−5.2442E−01 A6=   6.6961E−02 −1.1178E−01   7.0881E−02   3.5528E−01  2.6868E−02   4.7189E−01 A8= −1.3593E−01 −1.8600E−01   8.6259E−01−1.5734E−01 −5.9886E−03 −3.5565E−01 A10=   2.3675E−01   2.6582E−01−2.2376E+00 −1.3793E−01 −3.3017E−03   1.7303E−01 A12= −2.1436E−01−1.4600E−01   2.3995E+00   2.1075E−01   5.9864E−03 −5.3655E−02 A14=  9.7216E−02   5.9987E−02 −1.2963E+00 −1.2000E−01 −2.7990E−03  1.1451E−02 A16= −1.5065E−02 −4.5222E−03   2.8808E−01   3.7316E−02  5.5421E−04 −1.9103E−03 A18= — — — −6.3139E−03 −4.0836E−05   2.4098E−04A20= — — —   4.5579E−04 — −1.5284E−05

In the 6th embodiment, the equation of the aspheric surface profiles ofthe aforementioned lens elements is the same as the equation of the 1stembodiment. Also, the definitions of these parameters shown in thefollowing table are the same as those stated in the 1st embodiment withcorresponding values for the 6th embodiment, so an explanation in thisregard will not be provided again.

Moreover, these parameters can be calculated from Table 11 and Table 12as the following values and satisfy the following conditions:

6th Embodiment f [mm] 1.77 |f4/f5| 0.34 Fno 2.00 (|f/f1| + |f/f3| +|f/f5|)/ 0.22 (|f/f2| + |f/f4| + |f/f6|) HFOV [deg.] 54.7 f/EPD 2.00V3/N3 14.34 tan (HFOV) 1.41 V6/N6 19.09 Dsr3/Dsr4 0.06 CT1/T12 0.66SD/TD 0.81 CT4/CT2 1.34 TL/f 2.26 T45/T34 0.20 TL/ImgH 1.81 (T45 +T56)/CT4 0.23 TL²/(ImgH × EPD) 8.21 (T23 + T45)/(CT2 + CT4) 0.125|f/R1| + |f/R2| 0.25 f/R10 1.790 |f/R3| + |f/R4| 1.00 (R3 + R4)/(R3 −R4) 0.952 |f/R5| + |f/R6| 2.22 (R11 + R12)/(R11 − R12) 1.117 |f/R7| +|f/R8| 3.03 |R4/R3| + |R8/R7| 0.208 |f/R9| + |f/R10| 2.84 |f2/f1| 0.07|f/R11| + |f/R12| 1.77 |f2/f5| 0.78 — —

7th Embodiment

FIG. 13 is a schematic view of an image capturing unit according to the7th embodiment of the present disclosure. FIG. 14 shows, in order fromleft to right, spherical aberration curves, astigmatic field curves anda distortion curve of the image capturing unit according to the 7thembodiment. In FIG. 13 , the image capturing unit includes thephotographing lens assembly (its reference numeral is omitted) of thepresent disclosure and an image sensor 790. The photographing lensassembly includes, in order from an object side to an image side, afirst lens element 710, an aperture stop 700, a second lens element 720,a third lens element 730, a fourth lens element 740, a fifth lenselement 750, a sixth lens element 760, a filter 770 and an image surface780. The photographing lens assembly includes six lens elements (710,720, 730, 740, 750 and 760) with no additional lens element disposedbetween each of the adjacent six lens elements.

The first lens element 710 with negative refractive power has anobject-side surface 711 being concave in a paraxial region thereof andan image-side surface 712 being convex in a paraxial region thereof. Thefirst lens element 710 is made of plastic material and has theobject-side surface 711 and the image-side surface 712 being bothaspheric.

The second lens element 720 with positive refractive power has anobject-side surface 721 being convex in a paraxial region thereof and animage-side surface 722 being convex in a paraxial region thereof. Thesecond lens element 720 is made of plastic material and has theobject-side surface 721 and the image-side surface 722 being bothaspheric.

The third lens element 730 with negative refractive power has anobject-side surface 731 being convex in a paraxial region thereof and animage-side surface 732 being concave in a paraxial region thereof. Thethird lens element 730 is made of plastic material and has theobject-side surface 731 and the image-side surface 732 being bothaspheric.

The fourth lens element 740 with positive refractive power has anobject-side surface 741 being concave in a paraxial region thereof andan image-side surface 742 being convex in a paraxial region thereof. Thefourth lens element 740 is made of plastic material and has theobject-side surface 741 and the image-side surface 742 being bothaspheric.

The fifth lens element 750 with negative refractive power has anobject-side surface 751 being convex in a paraxial region thereof and animage-side surface 752 being concave in a paraxial region thereof. Thefifth lens element 750 is made of plastic material and has theobject-side surface 751 and the image-side surface 752 being bothaspheric.

The sixth lens element 760 with negative refractive power has anobject-side surface 761 being convex in a paraxial region thereof and animage-side surface 762 being concave in a paraxial region thereof. Thesixth lens element 760 is made of plastic material and has theobject-side surface 761 and the image-side surface 762 being bothaspheric. The image-side surface 762 of the sixth lens element 760 hasat least one inflection point.

The filter 770 is made of glass material and located between the sixthlens element 760 and the image surface 780, and will not affect thefocal length of the photographing lens assembly. The image sensor 790 isdisposed on or near the image surface 780 of the photographing lensassembly.

The detailed optical data of the 7th embodiment are shown in Table 13and the aspheric surface data are shown in Table 14 below.

TABLE 13 7th Embodiment f = 1.66 mm, Fno = 1.88, HFOV = 55.0 deg. FocalSurface # Curvature Radius Thickness Material Index Abbe # Length 0Object Plano Infinity 1 Lens 1 −8.916 (ASP) 0.300 Plastic 1.584 28.2−28.02 2 −19.821 (ASP) 0.446 3 Ape. Stop Plano 0.035 4 Lens 2 679.504(ASP) 0.632 Plastic 1.545 56.1 2.50 5 −1.367 (ASP) 0.070 6 Lens 3 1.620(ASP) 0.200 Plastic 1.650 21.5 −15.62 7 1.329 (ASP) 0.189 8 Lens 4−5.660 (ASP) 0.800 Plastic 1.545 56.1 1.28 9 −0.652 (ASP) 0.035 10 Lens5 1.723 (ASP) 0.261 Plastic 1.650 21.5 −3.20 11 0.887 (ASP) 0.108 12Lens 6 11.947 (ASP) 0.230 Plastic 1.582 30.2 −2.20 13 1.151 (ASP) 0.35014 Filter Plano 0.110 Glass 1.517 64.2 — 15 Plano 0.187 16 Image Plano —Note: Reference wavelength is 587.6 nm (d-line).

TABLE 14 Aspheric Coefficients Surface # 1 2 4 5 6 7 k= −2.0058E+01  7.4740E+00 −2.0058E+01   1.9147E+00 −2.0058E+01 −3.1750E+00 A4=  3.2606E−01   5.5726E−01 −1.5567E−01 −4.7925E−01 −3.6951E−01−4.1202E−01 A6= −3.2463E−01 −1.3272E+00 −2.4093E−01   1.4388E+00  7.3213E−01   8.1688E−01 A8=   5.9803E−01   6.9856E+00 −8.0711E−01−2.3650E+00 −1.9260E+00 −1.5752E+00 A10= −8.0081E−01 −2.3606E+01−2.0635E+00   1.5267E+00   3.0299E+00   1.8758E+00 A12=   6.4513E−01  4.6031E+01 −8.6042E−11 −8.0398E−01 −2.8917E+00 −1.2366E+00 A14=−2.1395E−01 −4.5484E+01 —   3.1247E−04   1.2539E+00   3.3314E−01 A16= —  1.7232E+01 — — −2.2593E−12   1.7405E−05 Surface # 8 9 10 11 12 13 k=  1.3889E+01 −1.5051E+00 −9.0475E+01 −1.2206E+01   3.2551E+01−8.2351E−01 A4=   2.0925E−02   1.0808E−01 −6.0896E−01 −5.0287E−01−1.7109E−02 −4.8113E−01 A6=   8.7641E−02 −1.2467E−01 −1.5447E+00  9.7446E−01 −5.9119E−02   4.3247E−01 A8= −1.3096E−01 −1.6560E−01  1.1607E+01 −1.3649E+00   1.1347E−01 −3.2496E−01 A10=   2.4653E−01  2.8802E−01 −3.3872E+01   1.3608E+00 −1.0983E−01   1.5187E−01 A12=−2.0353E−01 −1.3044E−01   5.1554E+01 −9.1651E−01   5.8518E−02−3.9145E−02 A14=   9.4734E−02   6.7633E−02 −4.0367E+01   3.8721E−01−1.7058E−02   4.1733E−03 A16= −1.8524E−02 −2.2499E−03   1.2626E+01−9.5052E−02   2.5649E−03   2.7571E−04 A18= — — —   1.1952E−02−1.5640E−04 −1.0433E−04 A20= — — — −5.5654E−04 —   6.6710E−06

In the 7th embodiment, the equation of the aspheric surface profiles ofthe aforementioned lens elements is the same as the equation of the 1stembodiment. Also, the definitions of these parameters shown in thefollowing table are the same as those stated in the 1st embodiment withcorresponding values for the 7th embodiment, so an explanation in thisregard will not be provided again.

Moreover, these parameters can be calculated from Table 13 and Table 14as the following values and satisfy the following conditions:

7th Embodiment f [mm] 1.66 |f4/f5| 0.40 Fno 1.88 (|f/f1| + |f/f3| +|f/f5|)/ 0.25 (|f/f2| + |f/f4| + |f/f6|) HFOV [deg.] 55.0 f/EPD 1.88V3/N3 13.03 tan (HFOV) 1.43 V6/N6 19.09 Dsr3/Dsr4 0.05 CT1/T12 0.62SD/TD 0.77 CT4/CT2 1.27 TL/f 2.38 T45/T34 0.19 TL/ImgH 1.78 (T45 +T56)/CT4 0.18 TL²/(ImgH × EPD) 7.98 (T23 + T45)/(CT2 + CT4) 0.073|f/R1| + |f/R2| 0.27 f/R10 1.874 |f/R3| + |f/R4| 1.22 (R3 + R4)/(R3 −R4) 0.996 |f/R5| + |f/R6| 2.28 (R11 + R12)/(R11 − R12) 1.213 |f/R7| +|f/R8| 2.84 |R4/R3| + |R8/R7| 0.117 |f/R9| + |f/R10| 2.84 |f2/f1| 0.09|f/R11| + |f/R12| 1.58 |f2/f5| 0.78 — —

8th Embodiment

FIG. 15 is a schematic view of an image capturing unit according to the8th embodiment of the present disclosure. FIG. 16 shows, in order fromleft to right, spherical aberration curves, astigmatic field curves anda distortion curve of the image capturing unit according to the 8thembodiment. In FIG. 15 , the image capturing unit includes thephotographing lens assembly (its reference numeral is omitted) of thepresent disclosure and an image sensor 890. The photographing lensassembly includes, in order from an object side to an image side, afirst lens element 810, an aperture stop 800, a second lens element 820,a stop 801, a third lens element 830, a fourth lens element 840, a fifthlens element 850, a sixth lens element 860, a filter 870 and an imagesurface 880. The photographing lens assembly includes six lens elements(810, 820, 830, 840, 850 and 860) with no additional lens elementdisposed between each of the adjacent six lens elements.

The first lens element 810 with negative refractive power has anobject-side surface 811 being concave in a paraxial region thereof andan image-side surface 812 being concave in a paraxial region thereof.The first lens element 810 is made of plastic material and has theobject-side surface 811 and the image-side surface 812 being bothaspheric.

The second lens element 820 with positive refractive power has anobject-side surface 821 being convex in a paraxial region thereof and animage-side surface 822 being convex in a paraxial region thereof. Thesecond lens element 820 is made of plastic material and has theobject-side surface 821 and the image-side surface 822 being bothaspheric.

The third lens element 830 with negative refractive power has anobject-side surface 831 being convex in a paraxial region thereof and animage-side surface 832 being concave in a paraxial region thereof. Thethird lens element 830 is made of plastic material and has theobject-side surface 831 and the image-side surface 832 being bothaspheric.

The fourth lens element 840 with positive refractive power has anobject-side surface 841 being concave in a paraxial region thereof andan image-side surface 842 being convex in a paraxial region thereof. Thefourth lens element 840 is made of plastic material and has theobject-side surface 841 and the image-side surface 842 being bothaspheric.

The fifth lens element 850 with negative refractive power has anobject-side surface 851 being concave in a paraxial region thereof andan image-side surface 852 being convex in a paraxial region thereof. Thefifth lens element 850 is made of plastic material and has theobject-side surface 851 and the image-side surface 852 being bothaspheric.

The sixth lens element 860 with negative refractive power has anobject-side surface 861 being concave in a paraxial region thereof andan image-side surface 862 being concave in a paraxial region thereof.The sixth lens element 860 is made of plastic material and has theobject-side surface 861 and the image-side surface 862 being bothaspheric. The image-side surface 862 of the sixth lens element 860 hasat least one inflection point.

The filter 870 is made of glass material and located between the sixthlens element 860 and the image surface 880, and will not affect thefocal length of the photographing lens assembly. The image sensor 890 isdisposed on or near the image surface 880 of the photographing lensassembly.

The detailed optical data of the 8th embodiment are shown in Table 15and the aspheric surface data are shown in Table 16 below.

TABLE 15 8th Embodiment f = 2.49 mm, Fno = 1.99, HFOV = 53.3 deg. FocalSurface # Curvature Radius Thickness Material Index Abbe # Length 0Object Plano Infinity 1 Lens 1 −12.946 (ASP) 0.314 Plastic 1.545 56.1−5.92 2 4.329 (ASP) 0.550 3 Ape. Stop Plano −0.020 4 Lens 2 2.807 (ASP)0.931 Plastic 1.544 56.0 1.85 5 −1.388 (ASP) −0.144 6 Stop Plano 0.174 7Lens 3 2.916 (ASP) 0.240 Plastic 1.640 22.0 −4.70 8 1.433 (ASP) 0.379 9Lens 4 −8.733 (ASP) 1.114 Plastic 1.544 56.0 1.85 10 −0.941 (ASP) 0.03511 Lens 5 −7.931 (ASP) 0.300 Plastic 1.600 28.5 −38.18 12 −12.301 (ASP)0.197 13 Lens 6 −8.962 (ASP) 0.320 Plastic 1.583 30.7 −1.78 14 1.188(ASP) 0.500 15 Filter Plano 0.110 Glass 1.517 64.2 — 16 Plano 0.289 17Image Plano — Note: Reference wavelength is 587.6 nm (d-line). Aneffective radius of the stop 801 (Surface 6) is 0.810 mm.

TABLE 16 Aspheric Coefficients Surface # 1 2 4 5 7 8 k=   4.5247E+01−8.1143E+01 −1.6961E−01 −1.9779E+00 −1.4985E+01 −3.7930E+00 A4=  2.4365E−01   4.9090E−01   3.7838E−02   1.0485E−02 −2.5981E−01−2.7949E−01 A6= −1.8365E−01 −2.7233E−01   1.6128E−03 −1.4103E−01  5.0569E−01   5.7874E−01 A8=   1.2406E−01   2.8426E−02 −2.8862E−01  1.9106E−02 −1.4304E+00 −1.0336E+00 A10= −6.8694E−02   6.9988E−01  4.8850E−01 −3.1539E−02   2.2781E+00   1.1503E+00 A12=   1.8876E−02−1.1055E+00 −5.5309E−01 −1.9365E−02 −2.2003E+00 −7.4547E−01 A14=−1.7128E−03   5.1025E−01 — —   9.2249E−01   2.1604E−01 Surface # 9 10 1112 13 14 k=   1.7479E+01 −1.0746E+00   1.7230E+01 −5.5504E+01  1.0538E+01 −9.4665E−01 A4=   5.5050E−02   1.5475E−01 −3.3121E−01−3.2557E−01 −9.0818E−02 −3.6791E−01 A6=   6.9873E−03   1.7524E−01  9.9727E−01   7.4354E−01 −7.0219E−02   2.3046E−01 A8= −2.5440E−02−6.0006E−01 −1.3855E+00 −7.6695E−01   9.4141E−02 −1.2045E−01 A10=  2.3845E−02   6.7284E−01   1.0219E+00   4.0953E−01 −3.4269E−02  4.6331E−02 A12= −1.3168E−02 −4.0477E−01 −4.4884E−01 −1.1868E−01  5.2545E−03 −1.2052E−02 A14=   2.0812E−03   1.3227E−01   1.0153E−01  1.7808E−02 −2.6688E−04   1.9505E−03 A16=   1.0603E−04 −1.8100E−02−7.5814E−03 −1.0877E−03 −5.2096E−06 −1.7492E−04 A18= — — — — —  6.6024E−06

In the 8th embodiment, the equation of the aspheric surface profiles ofthe aforementioned lens elements is the same as the equation of the 1stembodiment. Also, the definitions of these parameters shown in thefollowing table are the same as those stated in the 1st embodiment withcorresponding values for the 8th embodiment, so an explanation in thisregard will not be provided again.

Moreover, these parameters can be calculated from Table 15 and Table 16as the following values and satisfy the following conditions:

8th Embodiment f [mm] 2.49 |f4/f5| 0.05 Fno 1.99 (|f/f1| + |f/f3| +|f/f5|)/ 0.25 (|f/f2| + |f/f4| + |f/f6|) HFOV [deg.] 53.3 f/EPD 1.99V3/N3 13.41 tan (HFOV) 1.34 V6/N6 19.39 Dsr3/Dsr4 0.02 CT1/T12 0.59SD/TD 0.80 CT4/CT2 1.20 TL/f 2.12 T45/T34 0.09 TL/ImgH 1.82 (T45 +T56)/CT4 0.21 TL²/(ImgH × EPD) 7.70 (T23 + T45)/(CT2 + CT4) 0.032|f/R1| + |f/R2| 0.77 f/R10 −0.203 |f/R3| + |f/R4| 2.68 (R3 + R4)/(R3 −R4) 0.338 |f/R5| + |f/R6| 2.59 (R11 + R12)/(R11 − R12) 0.766 |f/R7| +|f/R8| 2.94 |R4/R3| + |R8/R7| 0.602 |f/R9| + |f/R10| 0.52 |f2/f1| 0.31|f/R11| + |f/R12| 2.38 |f2/f5| 0.05 — —

9th Embodiment

FIG. 17 is a schematic view of an image capturing unit according to the9th embodiment of the present disclosure. FIG. 18 shows, in order fromleft to right, spherical aberration curves, astigmatic field curves anda distortion curve of the image capturing unit according to the 9thembodiment. In FIG. 17 , the image capturing unit includes thephotographing lens assembly (its reference numeral is omitted) of thepresent disclosure and an image sensor 990. The photographing lensassembly includes, in order from an object side to an image side, afirst lens element 910, an aperture stop 900, a second lens element 920,a stop 901, a third lens element 930, a fourth lens element 940, a fifthlens element 950, a sixth lens element 960, a filter 970 and an imagesurface 980. The photographing lens assembly includes six lens elements(910, 920, 930, 940, 950 and 960) with no additional lens elementdisposed between each of the adjacent six lens elements.

The first lens element 910 with negative refractive power has anobject-side surface 911 being convex in a paraxial region thereof and animage-side surface 912 being concave in a paraxial region thereof. Thefirst lens element 910 is made of plastic material and has theobject-side surface 911 and the image-side surface 912 being bothaspheric.

The second lens element 920 with positive refractive power has anobject-side surface 921 being convex in a paraxial region thereof and animage-side surface 922 being convex in a paraxial region thereof. Thesecond lens element 920 is made of plastic material and has theobject-side surface 921 and the image-side surface 922 being bothaspheric.

The third lens element 930 with negative refractive power has anobject-side surface 931 being convex in a paraxial region thereof and animage-side surface 932 being concave in a paraxial region thereof. Thethird lens element 930 is made of plastic material and has theobject-side surface 931 and the image-side surface 932 being bothaspheric.

The fourth lens element 940 with positive refractive power has anobject-side surface 941 being concave in a paraxial region thereof andan image-side surface 942 being convex in a paraxial region thereof. Thefourth lens element 940 is made of plastic material and has theobject-side surface 941 and the image-side surface 942 being bothaspheric.

The fifth lens element 950 with negative refractive power has anobject-side surface 951 being concave in a paraxial region thereof andan image-side surface 952 being convex in a paraxial region thereof. Thefifth lens element 950 is made of plastic material and has theobject-side surface 951 and the image-side surface 952 being bothaspheric.

The sixth lens element 960 with negative refractive power has anobject-side surface 961 being concave in a paraxial region thereof andan image-side surface 962 being concave in a paraxial region thereof.The sixth lens element 960 is made of plastic material and has theobject-side surface 961 and the image-side surface 962 being bothaspheric. The image-side surface 962 of the sixth lens element 960 hasat least one inflection point.

The filter 970 is made of glass material and located between the sixthlens element 960 and the image surface 980, and will not affect thefocal length of the photographing lens assembly. The image sensor 990 isdisposed on or near the image surface 980 of the photographing lensassembly.

The detailed optical data of the 9th embodiment are shown in Table 17and the aspheric surface data are shown in Table 18 below.

TABLE 17 9th embodiment f = 2.39 mm, Fno = 1.99, HFOV = 53.5 deg. FocalSurface # Curvature Radius Thickness Material Index Abbe # Length 0Object Plano Infinity 1 Lens 1 64.666 (ASP) 0.301 Plastic 1.545 56.1−5.91 2 3.064 (ASP) 0.537 3 Ape. Stop Plano 0.012 4 Lens 2 3.411 (ASP)0.802 Plastic 1.545 56.1 1.80 5 −1.261 (ASP) −0.075 6 Stop Plano 0.105 7Lens 3 2.978 (ASP) 0.240 Plastic 1.639 23.5 −4.26 8 1.377 (ASP) 0.319 9Lens 4 −10.368 (ASP) 1.113 Plastic 1.544 56.0 1.82 10 −0.938 (ASP) 0.05211 Lens 5 −7.829 (ASP) 0.310 Plastic 1.614 26.0 −44.38 12 −11.153 (ASP)0.218 13 Lens 6 −8.912 (ASP) 0.320 Plastic 1.584 28.2 −1.80 14 1.206(ASP) 0.500 15 Filter Plano 0.110 Glass 1.517 64.2 — 16 Plano 0.262 17Image Plano — Note: Reference wavelength is 587.6 nm (d-line). Aneffective radius of the stop 901 (Surface 6) is 0.810 mm.

TABLE 18 Aspheric Coefficients Surface # 1 2 4 5 7 8 k=   9.0000E+01  7.4556E+00 −1.0297E+01 −1.2859E+00 −1.9031E+01 −3.5384E+00 A4=  2.8886E−01   4.2100E−01   4.4363E−02 −3.1499E−02 −3.4443E−01−3.4111E−01 A6= −2.0271E−01   4.1277E−02   2.7531E−02   1.1419E−01  9.7619E−01   8.5034E−01 A8=   1.5065E−01 −8.2210E−01 −7.7320E−01−9.5045E−01 −2.8799E+00 −1.6601E+00 A10= −6.4392E−02   2.8657E+00  1.6839E+00   1.3376E+00   4.7746E+00   2.0387E+00 A12= −3.8128E−03−3.4210E+00 −2.1694E+00 −8.4112E−01 −4.5421E+00 −1.4251E+00 A14=  4.5340E−03   1.2647E+00 — —   1.9149E+00   4.3846E−01 Surface # 9 1011 12 13 14 k= −7.8105E+01 −1.1036E+00   2.2358E+01   1.9084E+01  1.3423E+01 −9.4602E−01 A4=   5.3126E−02   2.1193E−01 −1.8411E−01−2.4812E−01 −1.1296E−01 −3.9655E−01 A6=   5.1110E−02   9.4021E−04  6.4374E−01   6.4062E−01 −5.1086E−02   2.6782E−01 A8= −1.6683E−01−3.8264E−01 −9.4437E−01 −7.4702E−01   9.8075E−02 −1.4928E−01 A10=  2.3338E−01   5.4290E−01   6.3757E−01   4.6234E−01 −4.2139E−02  6.1612E−02 A12= −1.6816E−01 −3.8819E−01 −2.1859E−01 −1.6375E−01  7.8976E−03 −1.7686E−02 A14=   5.6597E−02   1.5138E−01   1.6574E−02  3.3522E−02 −5.2681E−04   3.3350E−03 A16= −6.2668E−03 −2.4416E−02  6.6446E−03 −3.7076E−03 −2.5077E−05 −3.8843E−04 A18= — — —   1.7224E−04  3.7024E−06   2.5243E−05 A20= — — — — — −7.0196E−07

In the 9th embodiment, the equation of the aspheric surface profiles ofthe aforementioned lens elements is the same as the equation of the 1stembodiment. Also, the definitions of these parameters shown in thefollowing table are the same as those stated in the 1st embodiment withcorresponding values for the 9th embodiment, so an explanation in thisregard will not be provided again.

Moreover, these parameters can be calculated from Table 17 and Table 18as the following values and satisfy the following conditions:

9th Embodiment f [mm] 2.39 |f4/f5| 0.04 Fno 1.99 (|f/f1| + |f/f3| +|f/f5|)/ 0.26 (|f/f2| + |f/f4| + |f/f6|) HFOV [deg.] 53.5 f/EPD 1.99V3/N3 14.34 tan (HFOV) 1.35 V6/N6 17.80 Dsr3/Dsr4 0.01 CT1/T12 0.55SD/TD 0.80 CT4/CT2 1.39 TL/f 2.15 T45/T34 0.16 TL/ImgH 1.76 (T45 +T56)/CT4 0.24 TL²/(ImgH × EPD) 7.53 (T23 + T45)/(CT2 + CT4) 0.043|f/R1| + |f/R2| 0.82 f/R10 −0.214 |f/R3| + |f/R4| 2.59 (R3 + R4)/(R3 −R4) 0.460 |f/R5| + |f/R6| 2.53 (R11 + R12)/(R11 − R12) 0.762 |f/R7| +|f/R8| 2.77 |R4/R3| + |R8/R7| 0.460 |f/R9| + |f/R10| 0.52 |f2/f1| 0.30|f/R11| + |f/R12| 2.25 |f2/f5| 0.04 — —

10th Embodiment

FIG. 19 is a schematic view of an image capturing unit according to the10th embodiment of the present disclosure. FIG. 20 shows, in order fromleft to right, spherical aberration curves, astigmatic field curves anda distortion curve of the image capturing unit according to the 10thembodiment. In FIG. 19 , the image capturing unit includes thephotographing lens assembly (its reference numeral is omitted) of thepresent disclosure and an image sensor 1090. The photographing lensassembly includes, in order from an object side to an image side, afirst lens element 1010, an aperture stop 1000, a second lens element1020, a stop 1001, a third lens element 1030, a fourth lens element1040, a fifth lens element 1050, a sixth lens element 1060, a filter1070 and an image surface 1080. The photographing lens assembly includessix lens elements (1010, 1020, 1030, 1040, 1050 and 1060) with noadditional lens element disposed between each of the adjacent six lenselements.

The first lens element 1010 with negative refractive power has anobject-side surface 1011 being concave in a paraxial region thereof andan image-side surface 1012 being concave in a paraxial region thereof.The first lens element 1010 is made of plastic material and has theobject-side surface 1011 and the image-side surface 1012 being bothaspheric.

The second lens element 1020 with positive refractive power has anobject-side surface 1021 being convex in a paraxial region thereof andan image-side surface 1022 being convex in a paraxial region thereof.The second lens element 1020 is made of plastic material and has theobject-side surface 1021 and the image-side surface 1022 being bothaspheric.

The third lens element 1030 with negative refractive power has anobject-side surface 1031 being convex in a paraxial region thereof andan image-side surface 1032 being concave in a paraxial region thereof.The third lens element 1030 is made of plastic material and has theobject-side surface 1031 and the image-side surface 1032 being bothaspheric.

The fourth lens element 1040 with positive refractive power has anobject-side surface 1041 being convex in a paraxial region thereof andan image-side surface 1042 being convex in a paraxial region thereof.The fourth lens element 1040 is made of plastic material and has theobject-side surface 1041 and the image-side surface 1042 being bothaspheric.

The fifth lens element 1050 with positive refractive power has anobject-side surface 1051 being concave in a paraxial region thereof andan image-side surface 1052 being convex in a paraxial region thereof.The fifth lens element 1050 is made of plastic material and has theobject-side surface 1051 and the image-side surface 1052 being bothaspheric.

The sixth lens element 1060 with negative refractive power has anobject-side surface 1061 being concave in a paraxial region thereof andan image-side surface 1062 being concave in a paraxial region thereof.The sixth lens element 1060 is made of plastic material and has theobject-side surface 1061 and the image-side surface 1062 being bothaspheric. The image-side surface 1062 of the sixth lens element 1060 hasat least one inflection point.

The filter 1070 is made of glass material and located between the sixthlens element 1060 and the image surface 1080, and will not affect thefocal length of the photographing lens assembly. The image sensor 1090is disposed on or near the image surface 1080 of the photographing lensassembly.

The detailed optical data of the 10th embodiment are shown in Table 19and the aspheric surface data are shown in Table 20 below.

TABLE 19 10th embodiment f = 2.38 mm, Fno = 1.97, HFOV = 55.1 deg. FocalSurface # Curvature Radius Thickness Material Index Abbe # Length 0Object Plano Infinity 1 Lens 1 −25.458 (ASP) 0.231 Plastic 1.545 56.1−6.83 2 4.372 (ASP) 0.482 3 Ape. Stop Plano −0.008 4 Lens 2 4.324 (ASP)0.768 Plastic 1.545 56.1 1.99 5 −1.359 (ASP) −0.145 6 Stop Plano 0.180 7Lens 3 3.015 (ASP) 0.230 Plastic 1.639 23.5 −4.26 8 1.388 (ASP) 0.298 9Lens 4 200.000 (ASP) 1.209 Plastic 1.545 56.1 1.82 10 −0.993 (ASP) 0.05611 Lens 5 −12.280 (ASP) 0.312 Plastic 1.614 26.0 20.00 12 −6.198 (ASP)0.221 13 Lens 6 −8.546 (ASP) 0.321 Plastic 1.614 26.0 −1.61 14 1.136(ASP) 0.500 15 Filter Plano 0.110 Glass 1.517 64.2 — 16 Plano 0.274 17Image Plano — Note: Reference wavelength is 587.6 nm (d-line). Aneffective radius of the stop 1001 (Surface 6) is 0.740 mm.

TABLE 20 Aspheric Coefficients Surface # 1 2 4 5 7 8 k= −8.0767E+01  2.2221E+01 −5.9878E−01 −1.5052E+00 −2.3400E+01 −3.5131E+00 A4=  4.4665E−01   6.0613E−01   4.9519E−02   6.5987E−03 −2.5310E−01−3.4381E−01 A6= −3.7483E−01 −6.1515E−02 −7.1726E−02 −1.2907E−03  6.9368E−01   8.7342E−01 A8=   2.7278E−01 −1.2298E+00   2.8553E−02−6.9989E−01 −1.9841E+00 −1.6353E+00 A10= −2.8450E−03   4.5533E+00−4.3666E−01   9.2126E−01   3.0343E+00   1.8934E+00 A12= −1.5756E−01−4.6228E+00 — −5.3423E−01 −2.8573E+00 −1.2536E+00 A14=   5.6938E−02  5.4786E−01 — —   1.2538E+00   3.6813E−01 Surface # 9 10 11 12 13 14 k=−9.9000E+01 −9.9318E−01 −6.5400E+00 −7.6713E+00   1.1451E+01 −9.2969E−01A4=   4.3692E−02   1.9861E−01 −1.8238E−01 −2.0070E−01 −1.5589E−01−4.5461E−01 A6=   2.3466E−02 −5.6109E−02   6.6382E−01   6.1453E−01−1.4426E−02   3.2973E−01 A8= −1.3143E−01 −1.8723E−01 −1.0224E+00−7.4028E−01   1.1207E−01 −1.8487E−01 A10=   2.4808E−01   2.5389E−01  7.8261E−01   4.5604E−01 −6.8080E−02   7.4607E−02 A12= −2.2184E−01−1.5618E−01 −3.6560E−01 −1.5410E−01   1.9939E−02 −2.1122E−02 A14=  9.6377E−02   5.3328E−02   9.2453E−02   2.6965E−02 −3.2327E−03  4.0325E−03 A16= −1.6239E−02 −7.5184E−03 −8.6179E−03 −1.5234E−03  2.7986E−04 −4.8920E−04 A18= — — — −1.8447E−04 −1.0141E−05   3.3881E−05A20= — — —   2.2918E−05 — −1.0182E−06

In the 10th embodiment, the equation of the aspheric surface profiles ofthe aforementioned lens elements is the same as the equation of the 1stembodiment. Also, the definitions of these parameters shown in thefollowing table are the same as those stated in the 1st embodiment withcorresponding values for the 10th embodiment, so an explanation in thisregard will not be provided again.

Moreover, these parameters can be calculated from Table 19 and Table 20as the following values and satisfy the following conditions:

10th Embodiment f [mm] 2.38 |f4/f5| 0.09 Fno 1.97 (|f/f1| + |f/f3| +|f/f5|)/ 0.26 (|f/f2| + |f/f4| + |f/f6|) HFOV [deg.] 55.1 f/EPD 1.97V3/N3 14.34 tan (HFOV) 1.43 V6/N6 16.11 Dsr3/Dsr4 0.01 CT1/T12 0.49SD/TD 0.83 CT4/CT2 1.57 TL/f 2.11 T45/T34 0.19 TL/ImgH 1.68 (T45 +T56)/CT4 0.23 TL²/(ImgH × EPD) 7.00 (T23 + T45)/(CT2 + CT4) 0.046|f/R1| + |f/R2| 0.64 f/R10 −0.385 |f/R3| + |f/R4| 2.31 (R3 + R4)/(R3 −R4) 0.522 |f/R5| + |f/R6| 2.51 (R11 + R12)/(R11 − R12) 0.765 |f/R7| +|f/R8| 2.41 |R4/R3| + |R8/R7| 0.319 |f/R9| + |f/R10| 0.58 |f2/f1| 0.29|f/R11| + |f/R12| 2.38 |f2/f5| 0.10 — —

11th Embodiment

FIG. 21 is a perspective view of an image capturing unit according tothe 11th embodiment of the present disclosure. In this embodiment, animage capturing unit 10 is a camera module including a lens unit 11, adriving device 12, an image sensor 13 and an image stabilizer 14. Thelens unit 11 includes the photographing lens assembly disclosed in the1st embodiment, a barrel and a holder member (their reference numeralsare omitted) for holding the photographing lens assembly. The imaginglight converges in the lens unit 11 of the image capturing unit 10 togenerate an image with the driving device 12 utilized for image focusingon the image sensor 13, and the generated image is then digitallytransmitted to other electronic component for further processing.

The driving device 12 can have auto focusing functionality, anddifferent driving configurations can be obtained through the usages ofvoice coil motors (VCM), micro electro-mechanical systems (MEMS),piezoelectric systems, or shape memory alloy materials. The drivingdevice 12 is favorable for obtaining a better imaging position of thelens unit 11, so that a clear image of the imaged object can be capturedby the lens unit 11 with different object distances. The image sensor 13(for example, CCD or CMOS), which can feature high photosensitivity andlow noise, is disposed on the image surface of the photographing lensassembly to provide higher image quality.

The image stabilizer 14, such as an accelerometer, a gyro sensor and aHall Effect sensor, is configured to work with the driving device 12 toprovide optical image stabilization (OIS). The driving device 12 workingwith the image stabilizer 14 is favorable for compensating for pan andtilt of the lens unit 11 to reduce blurring associated with motionduring exposure. In some cases, the compensation can be provided byelectronic image stabilization (EIS) with image processing software,thereby improving image quality while in motion or low-light conditions.

12th Embodiment

FIG. 22 is one perspective view of an electronic device according to the12th embodiment of the present disclosure. FIG. 23 is anotherperspective view of the electronic device in FIG. 22 . FIG. 24 is ablock diagram of the electronic device in FIG. 22 . In this embodiment,an electronic device 20 is a smartphone including the image capturingunit 10 disclosed in the 11th embodiment, an image capturing unit 10 a,an image capturing unit 10 b, a flash module 21, a focus assist module22, an image signal processor 23, a user interface 24 and an imagesoftware processor 25. The image capturing unit 10, the image capturingunit 10 a and the image capturing unit 10 b all face the same directionand each has a single focal point. In this embodiment, the imagecapturing unit 10 is a wide-angle image capturing unit having arelatively large field of view, the image capturing unit 10 b is atelephoto image capturing unit having a relatively small field of view,and the image capturing unit 10 a has a field of view ranging betweenthat of the image capturing unit 10 and the image capturing unit 10 b;that is, the image capturing units 10, 10 a, 10 b have different fieldsof view to meet various photography requirements. In this embodiment,the electronic device 20 includes multiple image capturing units, butthe present disclosure is not limited to the number of image capturingunits.

When a user captures images of an object 26 through the user interface24, the light rays converge in the image capturing unit 10, the imagecapturing unit 10 a or the image capturing unit 10 b to generate animage, and the flash module 21 is activated for light supplement. Thefocus assist module 22 detects the object distance of the imaged object26 to achieve fast auto focusing. The image signal processor 23 isconfigured to optimize the captured image to improve image quality. Thelight beam emitted from the focus assist module 22 can be eitherconventional infrared or laser. The user interface 24 can be a touchscreen or a physical button. The user is able to interact with the userinterface 24 and the image software processor 25 having multiplefunctions to capture images and complete image processing.

The smartphone in this embodiment is only exemplary for showing theimage capturing unit 10 of the present disclosure installed in anelectronic device, and the present disclosure is not limited thereto.The image capturing unit 10 can be optionally applied to optical systemswith a movable focus. Furthermore, the photographing lens assembly ofthe image capturing unit 10 features good capability in aberrationcorrections and high image quality, and can be applied to 3D(three-dimensional) image capturing applications, in products such asdigital cameras, mobile devices, digital tablets, smart televisions,network surveillance devices, dashboard cameras, vehicle backup cameras,multi-camera devices, image recognition systems, motion sensing inputdevices, wearable devices and other electronic imaging devices.

The foregoing description, for the purpose of explanation, has beendescribed with reference to specific embodiments. It is to be noted thatTABLES 1-20 show different data of the different embodiments; however,the data of the different embodiments are obtained from experiments. Theembodiments were chosen and described in order to best explain theprinciples of the disclosure and its practical applications, to therebyenable others skilled in the art to best utilize the disclosure andvarious embodiments with various modifications as are suited to theparticular use contemplated. The embodiments depicted above and theappended drawings are exemplary and are not intended to be exhaustive orto limit the scope of the present disclosure to the precise formsdisclosed. Many modifications and variations are possible in view of theabove teachings.

What is claimed is:
 1. A photographing lens assembly comprising six lenselements, the six lens elements being, in order from an object side toan image side, a first lens element, a second lens element, a third lenselement, a fourth lens element, a fifth lens element and a sixth lenselement; wherein the first lens element has negative refractive power,the second lens element has positive refractive power, the sixth lenselement has an image-side surface being concave in a paraxial regionthereof, the image-side surface of the sixth lens element has at leastone inflection point, and a central thickness of the first lens elementis smaller than a central thickness of the sixth lens element; whereinan Abbe number of the third lens element is V3, an Abbe number of thesixth lens element is V6, a refractive index of the third lens elementis N3, a refractive index of the sixth lens element is N6, a curvatureradius of an object-side surface of the second lens element is R3, acurvature radius of an image-side surface of the second lens element isR4, half of a maximum field of view of the photographing lens assemblyis HFOV, a focal length of the first lens element is f1, a focal lengthof the second lens element is f2, and the following conditions aresatisfied:10.0<V6/N6<25.0;10.0<V3/N3<15.0;0.10<(R3+R4)/(R3−R4)<2.0;1.20<tan(HFOV)<2.50; and|f2/f1|<0.40.
 2. The photographing lens assembly of claim 1, wherein thethird lens element has an object-side surface being convex in a paraxialregion thereof and an image-side surface being concave in a paraxialregion thereof, and the sixth lens element has negative refractivepower.
 3. The photographing lens assembly of claim 1, wherein the fourthlens element with positive refractive power has an image-side surfacebeing convex in a paraxial region thereof, and at least three of the sixlens elements of the photographing lens assembly are made of plasticmaterial.
 4. The photographing lens assembly of claim 1, furthercomprising an aperture stop, wherein an axial distance between theaperture stop and the image-side surface of the sixth lens element isSD, an axial distance between an object-side surface of the first lenselement and the image-side surface of the sixth lens element is TD, afocal length of the photographing lens assembly is f, an entrance pupildiameter of the photographing lens assembly is EPD, and the followingconditions are satisfied:0.72<SD/TD<0.95; and1.20<f/EPD<2.30.
 5. The photographing lens assembly of claim 1, furthercomprising an aperture stop disposed between the first lens element andthe second lens element, wherein an axial distance between the aperturestop and the object-side surface of the second lens element is Dsr3, anaxial distance between the aperture stop and the image-side surface ofthe second lens element is Dsr4, and the following condition issatisfied:0≤Dsr3/Dsr4<0.50.
 6. The photographing lens assembly of claim 5, whereinthe axial distance between the aperture stop and the object-side surfaceof the second lens element is Dsr3, the axial distance between theaperture stop and the image-side surface of the second lens element isDsr4, and the following condition is satisfied:0≤Dsr3/Dsr4<0.15.
 7. The photographing lens assembly of claim 1, whereinthe focal length of the second lens element is f2, a focal length of thefifth lens element is f5, and the following condition is satisfied:|f2/f5|<0.95.
 8. The photographing lens assembly of claim 1, wherein thecurvature radius of the object-side surface of the second lens elementis R3, the curvature radius of the image-side surface of the second lenselement is R4, a curvature radius of an object-side surface of thefourth lens element is R7, a curvature radius of an image-side surfaceof the fourth lens element is R8, and the following condition issatisfied:|R4/R3|+|R8/R7|<0.85.
 9. The photographing lens assembly of claim 1,wherein an axial distance between the second lens element and the thirdlens element is T23, an axial distance between the fourth lens elementand the fifth lens element is T45, a central thickness of the secondlens element is CT2, a central thickness of the fourth lens element isCT4, and the following condition is satisfied:0<(T23+T45)/(CT2+CT4)<0.20.
 10. The photographing lens assembly of claim1, wherein a focal length of the photographing lens assembly is f, acurvature radius of an object-side surface of one lens element of thesix lens elements is Rf, a curvature radius of an image-side surface ofthe lens element of the six lens elements is Rr, and at least one of thesix lens elements satisfies the following condition:|f/Rf|+|f/Rr|21 0.30.
 11. A photographing lens assembly comprising sixlens elements, the six lens elements being, in order from an object sideto an image side, a first lens element, a second lens element, a thirdlens element, a fourth lens element, a fifth lens element and a sixthlens element; wherein the first lens element has an object-side surfacebeing concave in a paraxial region thereof, the second lens element haspositive refractive power, the sixth lens element has an image-sidesurface being concave in a paraxial region thereof, the image-sidesurface of the sixth lens element has at least one inflection point, anda central thickness of the first lens element is smaller than a centralthickness of the sixth lens element; wherein an Abbe number of the thirdlens element is V3, an Abbe number of the sixth lens element is V6, arefractive index of the third lens element is N3, a refractive index ofthe sixth lens element is N6, a curvature radius of an object-sidesurface of the second lens element is R3, a curvature radius of animage-side surface of the second lens element is R4, a curvature radiusof an object-side surface of the sixth lens element is R11, a curvatureradius of the image-side surface of the sixth lens element is R12, andthe following conditions are satisfied:10.0<V6/N6<25.0;10.0<V3/N3<15.0;0.10<(R3+R4)/(R3−R4)<2.0; and−3.50<(R11+R12)/(R11−R12)<2.50.
 12. The photographing lens assembly ofclaim 11, wherein the curvature radius of the object-side surface of thesecond lens element is R3, the curvature radius of the image-sidesurface of the second lens element is R4, and the following condition issatisfied:0.338≤(R3+R4)/(R3−R4)<2.0.
 13. The photographing lens assembly of claim11, wherein an axial distance between the object-side surface of thefirst lens element and an image surface is TL, a focal length of thephotographing lens assembly is f, and the following condition issatisfied:1.90<TL/f≤2.18.
 14. The photographing lens assembly of claim 11, whereinan axial distance between the object-side surface of the first lenselement and an image surface is TL, a maximum image height of thephotographing lens assembly is ImgH, and the following condition issatisfied:1.0<TL/ImgH≤1.82.
 15. The photographing lens assembly of claim 11,wherein a focal length of the photographing lens assembly is f, anentrance pupil diameter of the photographing lens assembly is EPD, andthe following condition is satisfied:1.20<f/EPD<2.10.
 16. The photographing lens assembly of claim 11,wherein an axial distance between the fourth lens element and the fifthlens element is T45, an axial distance between the fifth lens elementand the sixth lens element is T56, a central thickness of the fourthlens element is CT4, and the following condition is satisfied:(T45+T56)/CT4<0.55.
 17. The photographing lens assembly of claim 11,wherein the central thickness of the first lens element is CT1, an axialdistance between the first lens element and the second lens element isT12, and the following condition is satisfied:0.20<CT1/T12≤0.59.
 18. The photographing lens assembly of claim 11,wherein a central thickness of the second lens element is CT2, a centralthickness of the fourth lens element is CT4, an axial distance betweenthe third lens element and the fourth lens element is T34, an axialdistance between the fourth lens element and the fifth lens element isT45, and the following conditions are satisfied:1.05<CT4/CT2<3.0; and0<T45/T34<0.90.
 19. The photographing lens assembly of claim 11, whereinan axial distance between the object-side surface of the first lenselement and an image surface is TL, a maximum image height of thephotographing lens assembly is ImgH, an entrance pupil diameter of thephotographing lens assembly is EPD, and the following condition issatisfied:4.0<TL ²/(ImgH×EPD)<8.30.
 20. A photographing lens assembly comprisingsix lens elements, the six lens elements being, in order from an objectside to an image side, a first lens element, a second lens element, athird lens element, a fourth lens element, a fifth lens element and asixth lens element; wherein the first lens element has an object-sidesurface being concave in a paraxial region thereof, the second lenselement with positive refractive power has an object-side surface beingconvex in a paraxial region thereof, the third lens element has anobject-side surface being convex in a paraxial region thereof, the sixthlens element with negative refractive power has an image-side surfacebeing concave in a paraxial region thereof, the image-side surface ofthe sixth lens element has at least one inflection point, a centralthickness of the first lens element is smaller than a central thicknessof the fourth lens element, and an absolute value of a curvature radiusof the object-side surface of the first lens element is smaller than anabsolute value of a curvature radius of the object-side surface of thefifth lens element; wherein an Abbe number of the sixth lens element isV6, a refractive index of the sixth lens element is N6, and thefollowing condition is satisfied:10.0<V6/N6<25.0.
 21. The photographing lens assembly of claim 20,wherein the first lens element with negative refractive power has animage-side surface being concave in a paraxial region thereof, and thefifth lens element with positive refractive power has an image-sidesurface being convex in a paraxial region thereof.
 22. The photographinglens assembly of claim 20, wherein half of a maximum field of view ofthe photographing lens assembly is HFOV, a focal length of thephotographing lens assembly is f, an entrance pupil diameter of thephotographing lens assembly is EPD, and the following conditions aresatisfied:1.20<tan(HFOV)<2.50; and1.20<f/EPD<2.30.
 23. The photographing lens assembly of claim 20,wherein the central thickness of the first lens element is CT1, thecentral thickness of the fourth lens element is CT4, an axial distancebetween the first lens element and the second lens element is T12, anaxial distance between the fourth lens element and the fifth lenselement is T45, an axial distance between the fifth lens element and thesixth lens element is T56, and the following conditions are satisfied:0.10<CT1/T12<3.3; and(T45+T56)/CT4<1.0.
 24. The photographing lens assembly of claim 20,wherein a curvature radius of an object-side surface of the sixth lenselement is R11, a curvature radius of the image-side surface of thesixth lens element is R12, and the following condition is satisfied:−3.50<(R11+R12)/(R11−R12)<2.50.
 25. The photographing lens assembly ofclaim 20, wherein an axial distance between the object-side surface ofthe first lens element and an image surface is TL, a maximum imageheight of the photographing lens assembly is ImgH, and the followingcondition is satisfied:1.0<TL/ImgH<2.0.
 26. The photographing lens assembly of claim 20,wherein an axial distance between the third lens element and the fourthlens element is T34, an axial distance between the fourth lens elementand the fifth lens element is T45, and the following condition issatisfied:0<T45/T34<0.90.
 27. The photographing lens assembly of claim 20, whereinan axial distance between the object-side surface of the first lenselement and an image surface is TL, a focal length of the photographinglens assembly is f, and the following condition is satisfied:1.75<TL/f<3.0.
 28. An image capturing unit, comprising: thephotographing lens assembly of claim 20; and an image sensor disposed onan image surface of the photographing lens assembly.
 29. An electronicdevice, comprising: the image capturing unit of claim 28.